Article
Chemistry, Multidisciplinary
Svetlana Shostak, Woojin Park, Juwon Oh, Jinseok Kim, Seunghoon Lee, Hyeongwoo Nam, Michael Filatov, Dongho Kim, Cheol Ho Choi
Summary: The excited-state aromatization dynamics in the photochemical ring opening of DHA was investigated using nonadiabatic molecular dynamics simulations and the mixed-reference spin-flip (MRSF)-TDDFT method. It was found that the ring opening occurs in the excited state through a series of steps with increasing aromaticity. The competition between Baird and anti-Baird channels suggests that the quantum yield of the photochemical products can be controlled by tipping their balance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Naveen Kumar Tailor, Saurabh K. Saini, Pankaj Yadav, Mahesh Kumar, Soumitra Satapathi
Summary: Lead-free Cs2AgBiBr6 double perovskites show potential as an alternative to lead-based halide perovskites for photovoltaic and optoelectronic applications. This study reveals that the formation of small polarons and their localization limit the carrier dynamics in Cs2AgBiBr6 double-perovskite halide materials. The dominant conduction mechanism is found to be single polaron hopping. These findings provide important insights into the intrinsic limitations of Cs2AgBiBr6 perovskites and their applicability to other bismuth-based semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Heng Zhang, Elke Debroye, Wenhao Zheng, Shuai Fu, Lucia D. Virgilio, Pushpendra Kumar, Mischa Bonn, Hai Wang
Summary: The study reveals enhanced hot carrier mobility in Cs2AgBiBr6 double perovskite, with hot carriers showing up to fourfold enhancement compared to cold carriers and capable of long-range hot carrier transport. Evidence suggests that the enhanced conductivity primarily comes from hot holes with reduced momentum scattering in Cs2AgBiBr6. The findings suggest Cs2AgBiBr6 as a promising platform for studying hot carrier transport fundamentals and developing hot carrier-based optoelectronic devices.
Article
Chemistry, Multidisciplinary
Baoning Wang, Na Li, Lin Yang, Chunxiang Dall'Agnese, Ajay Kumar Jena, Tsutomu Miyasaka, Xiao-Feng Wang
Summary: The photovoltaic performance of Cs2AgBiBr6 perovskite was improved by introducing indoline dyes, leading to higher power conversion efficiencies and short-circuit current densities in the hybrid cells. The double perovskite functioned as a p-type interlayer to enhance overall performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Review
Chemistry, Multidisciplinary
Hongwei Lei, David Hardy, Feng Gao
Summary: Cs2AgBiBr6 as a benchmark lead-free double perovskite has shown promising potential in various applications such as solar cells, light/X-ray detectors, and ferroelectric/magnetic devices due to its high stability and exceptional optoelectronic properties. However, challenges still exist in Cs2AgBiBr6 materials and related applications, which require further research and exploration in the future for development.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Bingyue Li, Hui Li, Yanhui Sun, Mark G. Humphrey, Chi Zhang, Zhipeng Huang
Summary: This study reports the nonlinear optical properties of lead-free Cs2AgBiBr6 perovskite. Pristine Cs2AgBiBr6 thin film exhibits strong reverse saturable absorption (RSA), while Cs2AgBiBr6 thin film with defects (denoted as Cs2AgBiBr6(D)) shows saturable absorption (SA). The nonlinear absorption coefficients for Cs2AgBiBr6 are ca. 4.0 x 104 cm GW-1 (515 nm laser excitation) and 2.6 x 104 cm GW-1 (800 nm laser excitation), while for Cs2AgBiBr6(D) they are -2.0 x 104 cm GW-1 (515 nm laser excitation) and -7.1 x 103 cm GW-1 (800 nm laser excitation). The optical limiting threshold of Cs2AgBiBr6 is 8.1 x 10-4 J cm-2 (515 nm laser excitation). The samples show excellent long-term performance stability in air. The RSA of pristine Cs2AgBiBr6 correlates with excited-state absorption (515 nm laser excitation) and excited-state absorption following two-photon absorption (800 nm laser excitation), while the defects in Cs2AgBiBr6(D) strengthen the ground-state depletion and Pauli blocking, resulting in SA.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Wenjin Yu, Yu Zou, Hantao Wang, Bo Qu, Zhijian Chen, Lixin Xiao
Summary: The toxicity of lead-based halide perovskites limits their wide application in optoelectronics. The lead-free perovskite Cs2AgBiBr6 is a promising candidate due to its long carrier lifetime and outstanding stability. However, its large bandgap hinders absorption in the visible region, limiting its photoelectric properties. By facile elemental doping or substitution, Cs2AgBiBr6 can potentially be used in both visible and near-infrared regions. Band-edge adjustment or deep-energy-level doping can expand its absorption range, making it suitable for solar cells and photodetector applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Yalan She, Zhufeng Hou, Oleg Prezhdo, Wei Li
Summary: Pb-free double perovskites like Cs2AgBiBr6 have negatively charged Br vacancies that create detrimental defects, while substituting Ag with indium can mitigate hole trapping and trap-assisted charge recombination, thus improving the performance of optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Shaked Dror, Sasha Khalfin, Noam Veber, Arad Lang, Yaron Kauffmann, Maria Koifman Khristosov, Reut Shechter, Boaz Pokroy, Ivano E. Castelli, Yehonadav Bekenstein
Summary: Double-perovskite structures with the composition of Cs2AgBiBr6 are suggested as emerging inorganic semiconductors for solar energy conversion. Colloidal synthesis provides a methodological basis for investigating single monolayer two-dimensional materials and using them as building blocks for a more stable bilayer structure and thicker nanoplates. The colloidal approach enables the use of high-resolution transmission electron microscopy to detect structural defects, which is essential for improving the properties of bismuth-based lead-free double perovskites and bringing them closer to real-life photovoltaic implementation.
CHEMISTRY OF MATERIALS
(2023)
Article
Energy & Fuels
Wolfgang Tress, Maximilian T. Sirtl
Summary: Cs2AgBiBr6 double perovskites show high potential in solar cells, but major changes in absorption onset are needed to achieve higher efficiency. This material poses various scientific questions, and exact recombination and charge transport processes are yet to be unraveled, preparing us for the development of double perovskite or perovskite-like materials.
Article
Engineering, Electrical & Electronic
Hong Chen, Cai-Rong Zhang, Zi-Jiang Liu, Ji-Jun Gong, Wei Wang, You-Zhi Wu, Hong-Shan Chen
Summary: This study systematically investigated the vacancy defects in double perovskite Cs2AgBiBr6 and found that these defects can cause slight lattice deformation, change the band gap structure, enhance optical absorption capability, and increase exciton binding energies. The vacancy defects also lead to unbalanced charge transport properties and a red-shift in absorption spectra.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Subhash Chand Yadav, Abhishek Srivastava, Vishesh Manjunath, Archana Kanwade, Rupesh S. Devan, Parasharam M. Shirage
Summary: Cs2AgBiBr6 double halide-based lead-free perovskite solar cells have gained great attention in the research community due to their structural stability and optoelectronic properties. This report summarizes the multidimensional functionality of Cs2AgBiBr6 in various applications, and discusses the opportunities and obstacles for its use in lead-free perovskites. It provides a detailed analysis of the structural behavior, fabrication methods, and approaches to enhance performance and stability. Furthermore, it compares the performance of Cs2AgBiBr6 with different transport layers and modifications, and concludes with future perspectives.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Physical
Cai-Rong Zhang, Hong Chen, Zi-Jiang Liu, Mei-Ling Zhang, Wei Wang, You-Zhi Wu, Hong-Shan Chen
Summary: The study found that doping FA ions in Cs2AgBiBr6 crystals can stabilize optoelectronic properties, but it can also reduce exciton energies and charge carrier mobilities.
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2022)
Article
Engineering, Environmental
Bo Li, Xin Wu, Shoufeng Zhang, Zhen Li, Danpeng Gao, Xiankai Chen, Shuang Xiao, Chu-Chen Chueh, Zonglong Zhu
Summary: This study successfully improved the efficiency and stability of double perovskite solar cells by using fused-ring electron acceptor molecules for passivating defects. The modified devices demonstrated significantly increased open-circuit voltage and the highest efficiency achieved to date, along with superior long-term stability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Jiangning Li, Xianghuan Meng, Zhiheng Wu, Yanyan Duan, Ruxin Guo, Weidong Xiao, Yongshang Zhang, Yukun Li, Yonglong Shen, Wei Zhang, Guosheng Shao
Summary: By introducing ionic liquids, the power conversion efficiency and long-term stability of Cs2AgBiBr6-based perovskite solar cells have been improved by reducing bromide ion migration and film defects, and enhancing energy level matching.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Vincent J-Y Lim, Aleksander M. Ulatowski, Christina Kamaraki, Matthew T. Klug, Laura Miranda Perez, Michael B. Johnston, Laura M. Herz
Summary: Mixed lead-tin halide perovskites are suitable for the bottom subcell of all-perovskite tandem photovoltaic devices due to the bandgap-bowing effect. However, these materials degrade in ambient air, which negatively impacts their optoelectronic properties. This study unravels the degradation mechanisms of APb(x)Sn(1-x)I(3) perovskites and highlights the need for passivation strategies tailored specifically to mixed lead-tin iodide perovskites.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hochan Song, Jonghee Yang, Woo Hyeon Jeong, Jeongjae Lee, Tack Ho Lee, Jung Won Yoon, Hajin Lee, Alexandra J. Ramadan, Robert D. J. Oliver, Seong Chan Cho, Seul Gi Lim, Ji Won Jang, Zhongkai Yu, Jae Taek Oh, Eui Dae Jung, Myoung Hoon Song, Sung Heum Park, James R. Durrant, Henry J. Snaith, Sang Uck Lee, Bo Ram Lee, Hyosung Choi
Summary: This study explores a method to achieve high efficiency and stability in semiconducting lead halide perovskite nanocrystals (PNCs) through a single processing strategy by finding suitable surface ligands. The PNC ink prepared using this method can be used to fabricate both LED and PV devices, with peak electroluminescence external quantum efficiency of 17.00% and power conversion efficiency of 14.92%. It is found that a careful design of the aromatic rings in the ligands is crucial for achieving high performance, ease of processing, and improved phase stability. This research demonstrates the role of ligand design in PNC ink formulations for high-throughput production of optoelectronic devices and paves the way for dual-mode devices with both PV and LED functionalities.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shuaifeng Hu, Pei Zhao, Kyohei Nakano, Robert D. J. Oliver, Jorge Pascual, Joel A. A. Smith, Takumi Yamada, Minh Anh Truong, Richard Murdey, Nobutaka Shioya, Takeshi Hasegawa, Masahiro Ehara, Michael B. B. Johnston, Keisuke Tajima, Yoshihiko Kanemitsu, Henry J. J. Snaith, Atsushi Wakamiya
Summary: In this study, it is found that the surface treatment of mixed tin-lead halide perovskite films with piperazine promotes charge extraction, and combined treatment with CPTA reduces hysteresis and improves efficiency and stability of solar cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Peng Chen, Yun Xiao, Lei Li, Lichen Zhao, Maotao Yu, Shunde Li, Juntao Hu, Bin Liu, Yingguo Yang, Deying Luo, Cheng-Hung Hou, Xugang Guo, Jing-Jong Shyue, Zheng-Hong Lu, Qihuang Gong, Henry J. J. Snaith, Rui Zhu
Summary: An improved two-step sequential deposition technique is demonstrated for inverted-structure metal halide perovskite solar cells (PSCs), resulting in significantly enhanced performance. The bottom organic hole-selective layer is treated with a binary modulation system, leading to the refinement of up and buried interfaces for the perovskite films and improved charge transportation. The optimized PSCs achieve a high power conversion efficiency of 23.4% and demonstrate good operational and thermal stability.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
David P. McMeekin, Philippe Holzhey, Sebastian O. Furer, Steven P. Harvey, Laura T. Schelhas, James M. Ball, Suhas Mahesh, Seongrok Seo, Nicholas Hawkins, Jianfeng Lu, Michael B. Johnston, Joseph J. Berry, Udo Bach, Henry J. Snaith
Summary: Achieving long-term stability is the key challenge for widespread commercialization of perovskite solar cells. This study introduces a high-temperature dimethyl-sulfoxide-free processing method to control the crystallization of perovskite films, effectively improving the material quality and operational stability of the devices. The encapsulated devices showed improved lifetimes, with a median T80 of 1,190 hours and a champion device reaching a T80 of 1,410 hours.
Review
Chemistry, Physical
Osbel Almora, Derya Baran, Guillermo C. Bazan, Carlos I. Cabrera, Sule Erten-Ela, Karen Forberich, Fei Guo, Jens Hauch, Anita W. Y. Ho-Baillie, T. Jesper Jacobsson, Rene A. J. Janssen, Thomas Kirchartz, Nikos Kopidakis, Maria A. Loi, Richard R. Lunt, Xavier Mathew, Michael D. McGehee, Jie Min, David B. Mitzi, Mohammad K. Nazeeruddin, Jenny Nelson, Ana F. Nogueira, Ulrich W. Paetzold, Barry P. Rand, Uwe Rau, Henry J. Snaith, Eva Unger, Lidice Vaillant-Roca, Chenchen Yang, Hin-Lap Yip, Christoph J. Brabec
Summary: This article summarizes the best achievements in the performance of emerging photovoltaic devices in various research subjects, as reported in peer-reviewed articles since August 2021. The article provides updated graphs, tables, and analyses of performance parameters, and compares them based on the photovoltaic bandgap energy and average visible transmittance. The scope of the report is expanded to include triple junction solar cells.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Emil G. Dyrvik, Jonathan H. Warby, Melissa M. McCarthy, Alexandra J. Ramadan, Karl-Augustin Zaininger, Andreas E. Lauritzen, Suhas Mahesh, Robert A. Taylor, Henry J. Snaith
Summary: In this study, a thin Al2O3 layer grown by atomic layer deposition was used to selectively cover regions of imperfect hole transport layer deposition and form an intermixed composite with the organic transport layer. This technique improved electroluminescent external quantum efficiency in PeLEDs by reducing nonradiative recombination and improving carrier selectivity. The results show great potential for scale-up and application in other fields.
Article
Chemistry, Multidisciplinary
Heon Jin, Michael D. Farrar, James M. Ball, Akash Dasgupta, Pietro Caprioglio, Sudarshan Narayanan, Robert D. J. Oliver, Florine M. Rombach, Benjamin W. J. Putland, Michael B. Johnston, Henry J. Snaith
Summary: Mixed lead-tin halide perovskites show potential for high-efficiency tandem solar cells, but solution processing of thick films is challenging due to rapid crystallization and rough surfaces. This study improves the conformality of subsequent layers using alumina nanoparticles on the surface of rough films, resulting in a 65% increase in maximum-power-point efficiency and 28% improvement in steady-state V-OC. The nanoparticles also enhance device stability, with a six-fold increase in lifetime compared to pristine films.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Felix Schmidt, Meret Amrein, Sebastian Hedwig, Manuel Kober-Czerny, Adriana Paracchino, Ville Holappa, Riikka Suhonen, Andreas Schaeffer, Edwin C. Constable, Henry J. Snaith, Markus Lenz
Summary: Perovskite solar cells, which rely on the use of lead, face potential environmental concerns. A recycling process using hot water was demonstrated to effectively extract lead from synthetic precursor mixes, plastic-based, and glass-based perovskites with high efficiency. The extracted lead can be precipitated in high purity, allowing for its recovery. This straightforward method mitigates the risk of lead leaching at the end-of-life of perovskite solar cells.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Physical
Elena J. J. Cassella, Emma L. K. Spooner, Joel A. A. Smith, Timothy Thornber, Mary E. E. O'Kane, Robert D. J. Oliver, Thomas E. E. Catley, Saqlain Choudhary, Christopher J. J. Wood, Deborah B. B. Hammond, Henry J. J. Snaith, David G. G. Lidzey
Summary: Solvent-engineered deposition of high crystalline perovskite thin-films at room temperature using gas-quenching method has been achieved, leading to the fabrication of annealing-free perovskite solar cells (PSCs) with stabilized power conversion efficiencies (PCEs) up to 18.0%. Self-assembled molecules have been used as the hole-transporting layer, further improving the stabilized PCEs of annealing-free devices to 17.1%. This study provides a new approach for large-scale production of annealing-free PSCs.
ADVANCED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jessica L. Boland, Djamshid A. Damry, Chelsea Q. Xia, Piet Schoenherr, Dharmalingam Prabhakaran, Laura M. Herz, Thorsten Hesjedal, Michael B. Johnston
Summary: By exploiting band structure topology, both helicity-dependent and helicityindependent THz emission can be generated from nanowires of the topological Dirac semimetal Cd3As2. Narrowband THz pulses can be generated at oblique incidence by driving the system with optical (1.55 eV) pulses with circular polarization. Varying the incident angle also provides control of the peak emission frequency, with peak frequencies spanning 0.21-1.40 THz as the angle is tuned from 15 to 45 degrees. Therefore, Cd3As2 nanowires are considered a promising novel material platform for controllable terahertz emission.
Article
Chemistry, Physical
Karim A. Elmestekawy, Benjamin M. Gallant, Adam D. Wright, Philippe Holzhey, Nakita K. Noel, Michael B. Johnston, Henry J. Snaith, Laura M. Herz
Summary: This study explores the effects of three common solution-based film-fabrication methods on FAPbI3 crystals, and finds that two methods can reduce quantum confinement effects and improve the conversion efficiency and short-circuit current of solar cells. A meta-analysis of 244 articles and 825 photovoltaic devices confirms that PCE rarely exceeds a 20% threshold when these absorption features are present. Therefore, ensuring the absence of these absorption features should be the primary consideration when designing fabrication approaches for high-efficiency FAPbI3 solar cells.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Zhenglin Jia, Marcello Righetto, Yujie Yang, Chelsea Q. Xia, Yanyan Li, Ruiming Li, Yuwei Li, Bin Yu, Yong Liu, Huiming Huang, Michael B. Johnston, Laura M. Herz, Qianqian Lin
Summary: Chalcogenide-based semiconductors are promising for optoelectronic devices due to their low-cost, solution processability, stability, and tunable properties. However, the understanding of their fundamental optoelectronic properties is limited. In this study, we compare different chalcogenide absorbers to assess their suitability for various applications. We analyze their charge-carrier dynamics using optical-pump terahertz-probe spectroscopy and time-resolved microwave conductivity techniques. We find that antimony-based chalcogenide thin films have lower mobilities and shorter lifetimes than bismuth-based chalcogenides, with AgBiS2 thin films showing the highest mobility and Sb2S3 thin films having less energetic disorder, which are beneficial for photovoltaic devices. On the other hand, Bi(2)S(3 )exhibits ultralong carrier lifetime and high photoconductive gain, making it useful for designing photoconductors.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Snigdha Lal, Marcello Righetto, Aleksander M. Ulatowski, Silvia G. Motti, Zhuotong Sun, Judith L. MacManus-Driscoll, Robert L. Z. Hoye, Laura M. Herz
Summary: This study investigates the terahertz photoconductivity dynamics of thin films of BiOI and reveals a lack of self-trapping in charge carriers, leading to good charge-carrier mobility. The results show that BiOI has a higher potential as a light-harvesting semiconductor compared to traditional lead halide materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Mathias Uller Rothmann, Kilian B. Lohmann, Juliane Borchert, Michael B. Johnston, Keith P. McKenna, Laura M. Herz, Peter D. Nellist
Summary: Metal halide perovskite semiconductors, with an excess of lead iodide (PbI2) in the films, have demonstrated improved performance in solar cells. The coherence of the FAPbI(3):PbI2 interface in perovskite films is achieved through a 3R polytype formation of PbI2, which deviates from its common 2H hexagonal phase. The presence of PbI2 at the interface can help template perovskite crystal growth and passivate interfacial defects, leading to enhanced solar cell performance.
ADVANCED MATERIALS INTERFACES
(2023)
