Article
Optics
Wenjing Chen, Zongming Huang, Haitao Yao, Yan Liu, Yihan Zhang, Zhijian Li, Hongmin Zhou, Peng Xiao, Tao Chen, Haiding Sun, Jinsong Huang, Zhengguo Xiao
Summary: By minimizing the trap density using mixed cations and excess ammonium halides and polyvidone as precursors, the use of in situ solution-grown perovskite single crystals (SCs) can mitigate ion migration and severe Auger recombination, resulting in increased device lifetime and brightness.
Article
Multidisciplinary Sciences
Baoxing Liu, Junzi Li, Gui Wang, Fanghao Ye, Huibo Yan, Meng Zhang, Shou-Cheng Dong, Lei Lu, Pu Huang, Tingchao He, Ping Xu, Hoi-Sing Kwok, Guijun Li
Summary: This study proposes a strategy to enhance the radiative emission efficiency using a strained system, which contributes to the development of efficient PeLEDs.
Review
Physics, Applied
Lili Xu, Gaoyu Liu, Hengyang Xiang, Run Wang, Qingsong Shan, Shichen Yuan, Bo Cai, Zhi Li, Weijin Li, Shengli Zhang, Haibo Zeng
Summary: This review mainly discusses the charge-carrier dynamics of perovskite light-emitting diodes (PeLEDs), including radiative and non-radiative recombination, as well as various strategies to improve device performance and the influence of interfacial carrier dynamics.
APPLIED PHYSICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Yuan Liu, Yitong Dong, Tong Zhu, Dongxin Ma, Andrew Proppe, Bin Chen, Chao Zheng, Yi Hou, Seungjin Lee, Bin Sun, Eui Hyuk Jung, Fanglong Yuan, Ya-kun Wang, Laxmi Kishore Sagar, Sjoerd Hoogland, F. Pelayo Garcia de Arquer, Min-Jae Choi, Kamalpreet Singh, Shana O. Kelley, Oleksandr Voznyy, Zheng-Hong Lu, Edward H. Sargent
Summary: This study introduces a new type of perovskite quantum dots that remain stable in a thin layer of precursor solution and utilize strained QDs as nucleation centers to drive homogeneous crystallization. These new materials show suppressed Auger bi-exciton recombination and bright luminescence under high excitation, leading to primary red LEDs with significantly enhanced performance compared to control materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Optics
Young-Hoon Kim, Sungjin Kim, Arvin Kakekhani, Jinwoo Park, Jaehyeok Park, Yong-Hee Lee, Hengxing Xu, Satyawan Nagane, Robert B. Wexler, Dong-Hyeok Kim, Seung Hyeon Jo, Laura Martinez-Sarti, Peng Tan, Aditya Sadhanala, Gyeong-Su Park, Young-Woon Kim, Bin Hu, Henk J. Bolink, Seunghyup Yoo, Richard H. Friend, Andrew M. Rappe, Tae-Woo Lee
Summary: In this study, a one-dopant alloying strategy was employed to enhance electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) by reducing defect formation and enhancing charge carrier confinement. Surface-stabilizing agents and bromide vacancy healing agents were utilized to decrease defect density and improve carrier confinement, resulting in significant enhancement in performance.
Article
Materials Science, Multidisciplinary
Kai Zhang, Mingming Zhang, Ningning Zhu, Hongning Yin, Jun Xing, Lei Wang
Summary: The study systematically investigated the effect of different ligands on the optoelectrical properties and operational stability of cesium/methylammonium lead bromide PeLEDs. It was found that the phenylethylamine modified PeLED showed the best performance in terms of external quantum efficiency and operational stability, while the alkylamine-based devices had increasing EQEs with longer alkyl chain lengths. The degradation mechanism of the Perovskite LEDs was attributed to recrystallization causing changes in film morphology and crystallinity during operation.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Multidisciplinary Sciences
Dexin Yang, Guoling Zhang, Runchen Lai, Yao Cheng, Yaxiao Lian, Min Rao, Dexuan Huo, Dongchen Lan, Baodan Zhao, Dawei Di
Summary: The research demonstrates highly luminescent germanium-lead (Ge-Pb) perovskite films with considerably improved photoluminescence quantum efficiencies compared to other lead-based perovskite films, offering a new solution for developing eco-friendly light-emitting technologies based on perovskite semiconductors.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Yuanzhi Jiang, Junli Wei, Mingjian Yuan
Summary: Quasi-2D perovskites are seen as next-generation materials for light-emitting applications due to their excellent radiative efficiency and processability. They possess an energy-funneling process and can meet the requirements of stable emission and display technologies through various engineering strategies, providing promising directions for future advancements.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Zhaohua Zhu, Yan Wu, Yang Shen, Jihua Tan, Dong Shen, Ming-Fai Lo, Menglin Li, Yi Yuan, Jian-Xin Tang, Wenjun Zhang, Sai-Wing Tsang, Zhiqiang Guan, Chun-Sing Lee
Summary: This study presents a highly efficient sky-blue PeLED based on a quasi-two-dimensional structure with an external quantum efficiency of 13.8%. The high efficiency is achieved by suppressing both triplet and trap-assisted nonradiative energy loss using a ligand with high-triplet-energy and dual-functional passivation groups, proposing a universal strategy to improve the efficiency of sky-blue PeLEDs.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Kazushi Enomoto, Risa Oizumi, Naoya Aizawa, Takayuki Chiba, Yong-Jin Pu
Summary: Research shows that cesium lead halide perovskite nanocrystals, composed of the same halogen composition but with different sizes, can effectively suppress concentration quenching and exhibit high optical stability. The combination of blue-emitting and green-emitting nanocrystals in an energy donor-acceptor system demonstrates improved photoluminescence quantum yield in the film state, attributed to efficient suppression of concentration quenching through FRET from the blue-emitting nanocrystals to the green-emitting nanocrystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Jun Xi, Junseop Byeon, Unsoo Kim, Kijoon Bang, Gi Rim Han, Ji-Young Kim, Jungjin Yoon, Hua Dong, Zhaoxin Wu, Giorgio Divitini, Kai Xi, Jinwoo Park, Tae-Woo Lee, Seong Keun Kim, Mansoo Choi, Jong Woo Lee
Summary: This research reveals the correlation between the charge-carrier mechanism and the spatially heterogeneous RPP bulks induced by distinct sublattice cations in RPP devices. The study also discovered the design principle of promoting charge-carrier dynamics through heterogeneity in structures.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Zhan Chen, Xiao-Ke Liu, Heyong Wang, Xianjie Liu, Lintao Hou, Feng Gao
Summary: This study demonstrates significant photoluminescence enhancement in mixed halide blue perovskite films using benzylphosphonic acid, resulting in a doubled external quantum efficiency of 6.3% in sky-blue PeLEDs. The enhancement is achieved by forming an oxide-bonded perovskite surface at grain boundaries and suppressing electron-phonon interaction, leading to increased radiative recombination rate and reduced nonradiative recombination rate. Additionally, severe thermal quenching is observed in blue perovskite films, which can be explained by a two-step mechanism involving exciton dissociation and electron-phonon interaction.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Dezhong Zhang, Yunxing Fu, Hongmei Zhan, Chenyang Zhao, Xiang Gao, Chuanjiang Qin, Lixiang Wang
Summary: Emission thermal quenching is a common issue in quasi-2D perovskite emitters and greatly reduces the luminescence efficiency of PeLEDs. In this study, a passivation strategy is developed to investigate and suppress the thermal quenching, revealing the important role of defects. The defect-passivated PeLEDs achieve improved external quantum efficiency and longer operation lifetime.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Yajun Gao, Jiang Liu, Furkan H. Isikgor, Mingcong Wang, Jafar Khan, Stefaan De Wolf, Frederic Laquai
Summary: In this study, the interface carrier dynamics in metal halide perovskite (MHP) solar cells were investigated using ultrafast transient reflection (TR) spectroscopy. The addition of a LiF interlayer was found to reduce the interface-induced carrier recombination velocity and improve the open-circuit voltage of the devices. Furthermore, the effect of PhenHCl passivation on the carrier recombination velocity in CsFAMA was revealed.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Xiaopeng Feng, Yuhong He, Wei Qu, Jinmei Song, Wanting Pan, Mingrui Tan, Bai Yang, Haotong Wei
Summary: In this study, spray-coated quasi-2D hemispherical photodetectors based on phenylethylammonium/formamidinium lead halide perovskites were reported. The crystallization speed and film thickness were controlled by perovskite compositions and spray-coating cycles. The resulting photodetectors showed wide-angle light response and wavelength-selective imaging, with potential applications in intelligent recognition and intraoperative navigated surgery.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Tianran Liu, Xiaoming Zhao, Ping Wang, Quinn C. Burlingame, Junnan Hu, Kwangdong Roh, Zhaojian Xu, Barry P. Rand, Minjie Chen, Yueh-Lin Loo
Summary: This study demonstrates a transparent photovoltaic technology that absorbs ultraviolet light while maintaining high transparency and color neutrality. By precisely tuning the halide ratio during thermal co-evaporation, large-area perovskite films with ideal absorption cutoff can be achieved. The resulting transparent photovoltaics exhibit high visible transmittance, color rendering index, and output power density under solar illumination.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Zhaojian Xu, Ross A. Kerner, Steven P. Harvey, Kai Zhu, Joseph J. Berry, Barry P. Rand
Summary: Voltage-induced halide segregation in mixed-halide perovskite devices is limited by iodide oxidation at the anode, leading to iodide and bromide accumulation at the cathode and anode, respectively. Switching the anode material to Ag prevents segregation by inhibiting the oxidation of lattice iodide. This suggests that redox-active additives can be used to suppress halide segregation. Overall, this work provides new insights into the impact of voltage bias on halide perovskite devices.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jesse A. Wisch, Xiao Liu, Patrick J. Sarver, Cesar N. Prieto Kullmer, Agustin Millet, David W. C. MacMillan, Barry P. Rand
Summary: An organic diode is demonstrated to transfer energy near-field to molecules in solution through surface plasmon polaritons, which is different from the conventional far-field excitation via absorption of traveling photons. Electrically created excitons couple to surface plasmon modes in the cathode, leading to the subsequent excitation of chromophore molecules. The diode and the near-field energy transfer process are characterized using external quantum efficiency and time resolved photoluminescence measurements. Additionally, the potential of this device for photochemical applications is shown by the ability of excited chromophores to charge-transfer to quencher molecules.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
William B. Gunnarsson, Kwangdong Roh, Lianfeng Zhao, John P. Murphy, Alex J. Grede, Noel C. Giebink, Barry P. Rand
Summary: Thin-film organic, colloidal quantum dot, and metal halide perovskite semiconductors are all being researched for a wavelength-tunable diode laser technology that does not require epitaxial growth. Efforts have been made to overcome fundamental and practical barriers to achieve reliable injection lasing. Challenges in resonator design, electrical injection, and heat dissipation are outlined, and the unique optical gain physics of each system are discussed. Systematic progress will require new materials or indirect pumping schemes for organic and colloidal quantum dot laser diodes, while improvements in device architecture and film processing are crucial for perovskite lasers. The current status of nonepitaxial laser diodes is discussed in the context of their epitaxial counterparts, showing reasons to be optimistic for the future.
Article
Economics
Amelie C. Lemay, Sigurd Wagner, Barry P. Rand
Summary: We analyze a dataset of rooftop solar installations in the US, finding low adoption rates (0.93% on average) and the potential for fifteen states to meet their residential electricity demand through solar power. Factors positively correlated with solar adoption include insolation, retail electricity price, Democratic voting fraction, net metering, and fraction of science or engineering degree holders, while fraction of business or education degree holders is negatively correlated. Cost savings are a strong motivator for PV adoption, especially in Republican-majority areas, highlighting the importance of compensatory programs like net metering. However, barriers of knowledge and installation cost remain, suggesting the need for knowledge campaigns and stable financial incentives.
Article
Chemistry, Multidisciplinary
Lianfeng Zhao, Daniel D. Astridge, William B. Gunnarsson, Zhaojian Xu, Jisu Hong, Jonathan Scott, Sara Kacmoli, Khaled Al Kurdi, Stephen Barlow, Seth R. Marder, Claire F. Gmachl, Alan Sellinger, Barry P. Rand
Summary: The thermal stability of polymer hole-transport layers (HTLs) is found to be crucial for the performance and lifetime of metal halide perovskite light-emitting diodes (PeLEDs). PeLEDs with high glass-transition temperature polymer HTLs exhibit reduced external quantum efficiency (EQE) roll-off, higher breakdown current density, maximum radiance, and longer device lifetime. Furthermore, these devices driven by nanosecond electrical pulses achieve record-breaking radiance and EQE. The use of thermally stable polymer HTLs enables PeLEDs to sustain millions of electrical pulses before device failure.
Article
Chemistry, Physical
Tianran Liu, Quinn C. Burlingame, Marko R. Ivancevic, Xiao Liu, Junnan Hu, Barry P. Rand, Yueh-Lin Loo
Summary: In this study, the photostability of films and solar cells comprising Y-series non-fullerene acceptors were investigated. UV and near-UV photons were found to be responsible for the degradation of acceptors, leading to early performance losses in solar cells. The weak point in the Y-series acceptors susceptible to UV-induced cleavage was identified as the vinylene linkage between the core and electron-accepting moieties. The efficiency losses in organic photovoltaic cells were attributed to the formation of traps, reducing charge extraction efficiency and facilitating non-radiative recombination as the Y-series acceptors degrade.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Junnan Hu, Zhaojian Xu, Tucker L. Murrey, Istvan Pelczer, Antoine Kahn, Jeffrey Schwartz, Barry P. Rand
Summary: The thermal stress on lead perovskites leads to the formation of I2 and triiodide, which can attack and decompose the lead halide perovskites. However, the surface treatment with thiol reducing agents can prevent the decomposition and improve the stability and performance of the perovskite solar cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Marko R. Ivancevic, Melissa L. Ball, Vinayak Bhat, Jesse A. Wisch, Sean R. Parkin, Chad Risko, Barry P. Rand, Yueh-Lin Loo
Summary: Contorted polycyclic aromatic molecules have been studied as host molecules for fullerenes, but their association is generally weak. In this study, researchers designed and synthesized π-extended buckybowls with larger surface areas. These buckybowls can form stronger complexes with fullerenes, especially those with butoxy side chains, due to their larger dipole moments and preferred 1:2 stoichiometry.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Jisu Hong, Jingwan Kim, Zhijun Li, Chenhao Cong, Barry P. Rand, Sang Yong Nam, Se Hyun Kim, Yun-Hi Kim
Summary: In this study, a diketopyrrolopyrrole (DPP)-based polymer with long and branched alkyl side chains was designed to improve solubility. The introduction of the branched side chains allowed for π-π interactions and crystalline structures, while preventing steric hindrance. Using the EHD jet printing technique, the feasibility of using P29DPP-TT as a semiconductor in integrated electronic systems was examined, with promising field-effect mobility of 0.55 cm(2) V-1 s(-1).
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Quinn C. Burlingame, Xiao Liu, Melissa L. Ball, Barry P. Rand, Yueh-Lin Loo
Summary: Intermolecular charge-transfer excitons play a crucial role in determining the performance of organic solar cells. By investigating the voltage-dependent photoluminescence, photocurrent, and ultrafast pump-probe transient absorption spectra, the properties of charge transfer excitons can be revealed. The correlation between voltage-dependent photocurrent and charge-transfer exciton photoluminescence affects the photovoltaic fill factor, as efficient charge-transfer exciton dissociation requires voltage.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
