Article
Chemistry, Physical
Xin Song, Yuanxia Song, Hao Xu, Shenzheng Gao, Yanfeng Wang, Junjie Li, Jiefeng Hai, Wenzhu Liu, Weiguo Zhu
Summary: This study proposes a solvent-induced anti-aggregation strategy to improve the film quality and electron-transport capability of small molecule electron-transporting layers (ETL). This approach not only addresses the aggregation issue but also leads to efficient and stable organic optoelectronic devices.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kangning Zhang, Zhinan Jiang, Jiawei Qiao, Peng Lu, Chaochao Qin, Hang Yin, Xiaoyan Du, Wei Qin, Xiaotao Hao
Summary: The operational stability of high-performance organic solar cells based on Y-series small-molecule acceptors is hindered by strong photocarrier trapping processes governed by thermodynamic relaxation in the mixed morphological domains. Exciton-phonon coupling is identified as the cause of the photocarrier trapping, and a charge bridge approach is proposed to enhance device efficiency and photothermal stability by decoupling exciton-phonon interactions. Experimental proof is provided through the design and fabrication of quaternary OSCs with reduced energetic disorder and trap states. This work highlights the importance of tailoring exciton-phonon coupling behaviors for developing efficient and stable non-fullerene OSCs.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Rui Sun, Yao Wu, Xinrong Yang, Yuan Gao, Zeng Chen, Kai Li, Jiawei Qiao, Tao Wang, Jing Guo, Chao Liu, Xiaotao Hao, Haiming Zhu, Jie Min
Summary: The ternary strategy is an effective approach to achieve high-efficiency OSCs, but the nonradiative voltage loss limits further efficiency improvements. By incorporating an asymmetric guest acceptor BTP-2F2Cl, the OSCs show improved photoluminescence quantum yield, exciton diffusion length, and absorption spectrum, leading to enhanced power conversion efficiency.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Zhongyu Liu, Yingwei Li, Wonyong Shin, Rongchao Jin
Summary: This study compared thin-film and solution-based measurements to reveal the existence of core phonons in Au-25 nanoclusters, as well as the suppression mechanism of staple-shell phonons in the solid state.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Mauro Cainelli, Yoshitaka Tanimura
Summary: The study shows that strong nonlocal electron-phonon interaction under high temperature conditions favors exciton transfer processes and enhances the efficiency of organic photovoltaic materials, while the lifetime of the exciton becomes shorter due to a low-frequency local mode.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mathieu Mirjolet, Francisco Rivadulla, Premysl Marsik, Vladislav Borisov, Roser Valenti, Josep Fontcuberta
Summary: The article discusses the physics of strongly correlated electronic systems in transition metal oxides, using SrVO3 as an example to illustrate the limitations of electron-electron correlations in a Fermi liquid.
Article
Chemistry, Multidisciplinary
Peter A. A. Banks, Gabriele D'Avino, Guillaume Schweicher, Jeff Armstrong, Christian Ruzie, Jong Won Chung, Jeong-Il Park, Chizuru Sawabe, Toshihiro Okamoto, Jun Takeya, Henning Sirringhaus, Michael T. T. Ruggiero
Summary: A study demonstrates the mechanism of electron-phonon coupling and the impact of molecular design on organic semiconductor materials. It reveals the effects of less commonly studied molecular vibrations and provides insights for creating improved materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Junwei Liu, Jiawei Qiao, Kangkang Zhou, Jingjing Wang, Ruohua Gui, Kaihu Xian, Mengyuan Gao, Hang Yin, Xiaotao Hao, Zhihua Zhou, Long Ye
Summary: This study proposes a facile polymer blending strategy for directly synthesized CQD/polymer hybrid solar cells with a champion efficiency of 13%, leveraging optimized aggregation behaviors of conjugated polymer blends. The strategy also provides a dilution effect for photovoltaic polymers with excessively strong aggregation tendency, resulting in fast carrier transport and high photovoltaic performance. The relationships between polymer morphology, carrier transport, and photovoltaic performance are established to advance the progress of CQD/polymer hybrid solar cells.
Article
Chemistry, Physical
Mayra Peralta, Steven Feijoo, Solmar Varela, Rafael Gutierrez, Gianaurelio Cuniberti, Vladimiro Mujica, Ernesto Medina
Summary: We investigate the role of electron-spin-phonon coupling in DNA using an effective model Hamiltonian and its connection to the Chiral-Induced Spin Selectivity (CISS) effect. The semiclassical electron transfer in a tight-binding model of DNA with intrinsic spin-orbit coupling is described using the envelope function approach. We find that only acoustic modes exhibit spin-phonon coupling, while optical modes show electron-phonon interaction without spin coupling. An effective Hamiltonian is derived, in which the eigenstates carry spin currents protected by spin-inactive stretching optical modes. The stronger interaction between optical phonons and electrons allows for the decoherence effects and the spin filtering effects observed in CISS.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Gloria Anemone, Pablo Casado Aguilar, Manuela Garnica, Fabian Calleja, Amjad Al Taleb, Chia-Nung Kuo, Chin Shan Lue, Antonio Politano, Amadeo L. Vazquez de Parga, Giorgio Benedek, Daniel Farias, Rodolfo Miranda
Summary: The electron-phonon interaction in type II Dirac semimetallic 1T-PdTe2 has been determined using helium atom scattering, indicating a substantial electron-phonon coupling which is crucial for its superconductivity. This coupling value, along with the surface Debye temperature, accurately predicts the superconducting critical temperature, suggesting that the topological states of a Dirac cone have minimal influence on the onset of superconductivity.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Bing-Huang Jiang, Yi-Peng Wang, Chuang-Yi Liao, Yi-Ming Chang, Yu-Wei Su, Ru-Jong Jeng, Chih-Ping Chen
Summary: Non-fullerene organic photovoltaics (OPVs) have achieved high power conversion efficiencies (PCEs). By optimizing the blend morphology of a two-donor (PM6, TPD-3F)/one-acceptor (Y6) ternary blend, improved OPV performance was achieved. Good miscibility between PM6 and TPD-3F, combined with device optimization using 1-chloronaphthalene as an additive, resulted in efficient exciton dissociation and carrier transport for higher PCE.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Cheng Sun, Jin-Woo Lee, Changyeon Lee, Dongchan Lee, Shinuk Cho, Soon-Ki Kwon, Bumjoon J. Kim, Yun-Hi Kim
Summary: In this study, it is demonstrated that the dimerization of a small-molecule acceptor (SMA) significantly enhances the stability of SMA-based organic solar cells (OSC). The dimerized SMA (DYBO) leads to high-efficiency OSCs (> 18% PCE), outperforming OSCs based on their monomer counterpart MYBO (PCE = 17.1%). DYBO-based OSCs show excellent thermal and photo stability, retaining over 80% of initial PCE after 6,000 hours of thermal exposure at 100 degrees C, while MYBO-based OSCs degrade to -80% of their initial PCE value in 36 hours. The high stability of DYBO-based OSCs is mainly attributed to its high glass transition temperature (Tg) of 179 degrees C (Tg of MYBO = 80 degrees C) and improved blend miscibility that stabilizes the blend morphology under thermal stress.
Article
Chemistry, Multidisciplinary
Barbara Primera Darwich, Nestor Guijarro, Han-Hee Cho, Liang Yao, Luc Monnier, Pascal Schouwink, Mounir Mensi, Jun-Ho Yum, Kevin Sivula
Summary: Incorporating extended pi-conjugated organic cations into layered lead halide perovskites shows promise in improving device performance and stability. Tuning the chemical structure of ligands is crucial, with the resulting Lewis adduct between the BDT cation and surface iodide vacancies enhancing charge transport in the device active layer.
Article
Materials Science, Multidisciplinary
Gabriel Antonius, Steven G. Louie
Summary: This article discusses the effects of the electron-phonon interaction on optical excitations and presents a practical expression for the exciton-phonon self-energy. This expression describes the temperature dependence of the optical transition energies and their lifetime broadening resulting from the interaction between excitons and phonons.
Article
Chemistry, Multidisciplinary
Jeff K. Kerkovius, Alice R. Wong, Victor W. Mak, Sarah E. Reisman
Summary: The formation of quaternary stereogenic centers in polycyclic systems is achieved via a strategy based on the semi-pinacol reaction. Two fragments of similar size and complexity are joined by alkenyl lithium addition to an epoxy ketone, followed by a semi-pinacol rearrangement. Polycyclic scaffolds with quaternary stereogenic centers are generated in high yields, tolerating various functional groups. This method provides a useful strategy for the synthesis of complex polycyclic natural product-like scaffolds.
Article
Chemistry, Multidisciplinary
Lijiao Ma, Yong Cui, Jianqi Zhang, Kaihu Xian, Zhihao Chen, Kangkang Zhou, Tao Zhang, Wenxuan Wang, Huifeng Yao, Shaoqing Zhang, Xiaotao Hao, Long Ye, Jianhui Hou
Summary: The researchers have successfully achieved high efficiency and mechanical reliability in all-polymer organic photovoltaic (OPV) cells by introducing a polymer donor, PBDB-TF, with a high molecular weight. By adding the high molecular weight PBDB-TF as a third component into the PBQx-TF:PY-IT blend, they optimized the heterojunction morphology, enhancing charge transport efficiency and mechanical stress dissipation. As a result, the all-polymer OPV cells based on the ternary blend film showed a maximum power conversion efficiency (PCE) of 18.2% with a fill factor of 0.796. The flexible OPV cell also achieved a decent PCE of 16.5% with high mechanical stability. These findings provide a promising strategy for improving the mechanical properties and boosting the photovoltaic performance of all-polymer OPV cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yunhao Cai, Cong Xie, Qian Li, Chunhui Liu, Jiaxin Gao, Min Hun Jee, Jiawei Qiao, Yun Li, Jiali Song, Xiaotao Hao, Han Young Woo, Zheng Tang, Yinhua Zhou, Chunfeng Zhang, Hui Huang, Yanming Sun
Summary: Although all-polymer solar cells (all-PSCs) have great commercial potential, their power conversion efficiencies (PCEs) lag behind small molecule acceptor-based counterparts. Achieving optimized morphology and high molecular ordering in all-polymer blends is challenging due to competition between the crystallinity of the polymer donor and acceptor during film formation. In this study, a ternary strategy is employed to modulate the morphology and molecular crystallinity of an all-polymer blend, resulting in improved PCEs and performance.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tao Zhang, Ye Xu, Huifeng Yao, Jianqi Zhang, Pengqing Bi, Zhihao Chen, Jingwen Wang, Yong Cui, Lijiao Ma, Kaihu Xian, Zi Li, Xiaotao Hao, Zhixiang Wei, Jianhui Hou
Summary: By designing and synthesizing three ternary copolymers, PQB-x (x represents 1-3), the optical absorption spectrum and molecular energy levels of all-polymer solar cells (all-PSCs) can be tuned, and the energetic disorder can be suppressed by changing the molecular orientation. This study demonstrates that molecular design is a feasible method for improving the power conversion efficiencies of all-PSCs.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Tong Wang, Zhi-Hao Chen, Jia-Wei Qiao, Wei Qin, Jian-Qiang Liu, Xing-Zhu Wang, Yong-Jin Pu, Hang Yin, Xiao-Tao Hao
Summary: A general correlation between trap densities and charge transfer dynamics is established in high-efficiency organic photovoltaic blends. The electron transfer rates decrease with increased trap densities, while the hole transfer rates are independent of trap states. The local charges captured by traps induce potential barrier formation, suppressing electron transfer.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Min Li, Kangning Zhang, Jiawei Qiao, Qian Wang, Linghua Wang, Ming Sun, Lei Ying, Ning Li, Peng Lu, Hang Yin, Xiaoyan Du, Xiaotao Hao
Summary: The investigation of scalable coating techniques for high-performance photoactive materials involves studying the drying dynamics and kinetic quenching depth related degradation. The optimized PM6:BTP-eC9-based organic solar cells achieve power conversion efficiencies up to 16.81% by controlling film formation kinetics. The photoluminescence lifetime distribution serves as an alternative probe for the kinetic quenching depth, governing the degradation rate and providing mechanistic understanding of long-term stability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jingwen Wang, Yong Cui, Zhihao Chen, Jianqi Zhang, Yang Xiao, Tao Zhang, Wenxuan Wang, Ye Xu, Ni Yang, Huifeng Yao, Xiao-Tao Hao, Zhixiang Wei, Jianhui Hou
Summary: Low-bandgap materials have rapidly developed and improved the power conversion efficiencies of organic photovoltaic cells. However, the design of wide-bandgap non-fullerene acceptors (WBG-NFAs), necessary for indoor applications and tandem cells, has been lagging behind. In this study, two NFAs named ITCC-Cl and TIDC-Cl were successfully designed and synthesized. TIDC-Cl demonstrated a wider bandgap and higher electrostatic potential compared to ITCC and ITCC-Cl, resulting in efficient charge generation and a high PCE of 13.8% in PB2:TIDC-Cl-based cells.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Meng-Zhen Sha, Yong-Jin Pu, Hang Yin, Xiao-Tao Hao
Summary: Due to the prosperity of IoTs, indoor organic photovoltaic (IOPV) devices have emerged as reliable indoor photon harvesters with substantial advantages. Efforts have been made to improve the power conversion efficiency (PCE) of indoor solar cells and modules, with the efficiency of indoor light harvesters surpassing 30%. A critical review of IOPV devices is necessary for their appropriate applications. This review provides a detailed overview of IOPV devices, fabrication strategies, and multifunctional applications, as well as discussing challenges and prospects for further development and applications.
ORGANIC ELECTRONICS
(2023)
Article
Chemistry, Physical
Wentao Zou, Chenyang Han, Xu Zhang, Jiawei Qiao, Jifa Yu, Huajun Xu, Huanhuan Gao, Yanna Sun, Yuanyuan Kan, Xiaotao Hao, Guanghao Lu, Yingguo Yang, Ke Gao
Summary: In this study, a highly crystalline small molecule donor, ZW1, was used to fabricate D18:ZW1:Y6 ternary devices, optimizing the morphology and suppressing bimolecular recombination. The thick ternary OSCs achieved a high power conversion efficiency of 16.67% (300 nm thickness), significantly higher than binary devices.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Yanan Shi, Lingyun Zhu, Yangjun Yan, Meiling Xie, Guang Liang, Jiawei Qiao, Jianqi Zhang, Xiaotao Hao, Kun Lu, Zhixiang Wei
Summary: Non-radiative recombination energy loss (△E-3) is the main source of energy losses in organic solar cells (OSCs). Reducing the energetic disorder by modifying terminal groups has rarely been studied. In this study, acceptors with fluorinated phenyl terminal groups were investigated. The results show that these acceptors have smaller energetic disorder and achieve high efficiency and ultralow △E-3.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jianqiu Wang, Pengqing Bi, Yafei Wang, Zhong Zheng, Zhihao Chen, Jiawei Qiao, Wenxuan Wang, Jiayao Li, Cunbin An, Shaoqing Zhang, Xiaotao Hao, Jianhui Hou
Summary: The addition of the third component FTCC-Br into the active layer of OPV cells can improve absorption response, optimize morphology, and reduce charge recombination, leading to higher efficiency and stability.
Article
Engineering, Environmental
Haojiang Shen, Yixuan Xu, Wentao Zou, Wenqing Zhang, Jianfeng Li, Ping Cai, Yuan Guo, Huajun Xu, Xiaotao Hao, Yanna Sun, Yuanyuan Kan, Yingguo Yang, Ke Gao
Summary: The characteristics of small molecules in all-small-molecule organic solar cells (ASM OSCs), such as well-defined chemical structure and excellent reproducibility between batches, have attracted great attention. However, balancing the aggregation behaviors of small molecules is a challenge, limiting the further development of ASM OSCs' efficiency. The asymmetric ending group strategy has been successfully employed in non-fullerene acceptors (NFAs). Inspired by this, two asymmetric and symmetric small molecule donors, Por-DPP-TR and PTR, were synthesized. The efficiency of ASM OSCs reached 16.31%, ranking as one of the highest PCEs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Zhihao Chen, Huifeng Yao, Jingwen Wang, Jianqi Zhang, Tao Zhang, Zi Li, Jiawei Qiao, Shishuai Xiu, Xiaotao Hao, Jianhui Hou
Summary: In this study, 1,3,5-trimethoxybenzene (TMB) was incorporated as a solid additive to restrict energetic disorder and achieve high efficiency in organic solar cells. TMB showed strong electrostatic interaction with the terminal groups of non-fullerene acceptors (NFAs), facilitating face-to-face packing. It acted as a bridge during film formation to connect adjacent NFAs, and a controlled pi-pi stacking distance was obtained after volatilization. The optimized morphology limited energetic disorder, leading to enhanced exciton delocalization and reduced non-radiative energy loss. TMB-incorporated binary and ternary devices achieved high efficiencies of 18.61% and 19.30%, respectively. This work provides new insights into morphology optimization and offers inspiration for improving organic solar cell performance.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Jiali Song, Chao Li, Jiawei Qiao, Chunhui Liu, Yunhao Cai, Yun Li, Jiaxin Gao, Min Hun Jee, Xiaotao Hao, Han Young Woo, Zheng Tang, He Yan, Yanming Sun
Summary: Efficient ternary all-polymer solar cells were fabricated by introducing a fluorinated small molecular acceptor-derived polymer acceptor named PYF-T-o to improve the molecular crystallinity. The ternary all-PSC exhibited improved short-circuit current density and fill factor, resulting in an impressive efficiency of 18.15% (certified as 17.73%). Large-area and eco-friendly ternary all-PSCs were also obtained, showing great potential for future organic photovoltaic applications.
Article
Chemistry, Physical
Yina Zheng, Yao Wu, Zhihao Chen, Xinxin Xia, Yawen Li, Qiang Wu, Yuze Lin, Xinhui Lu, Xiaotao Hao, Jie Min
Summary: The device performance of polymer solar cells (PSCs) is closely related to the microstructure of the active layer. Using a conjugated-block copolymer (CBC) as the active layer, we compared its photovoltaic performance with that of the bulk heterojunction (BHJ) system. Although both systems show high device efficiencies, the contributions of relevant photovoltaic parameters are different. Our work demonstrates that CBC materials are promising for reducing the efficiency-stability gap of PSCs, compared to BHJ systems.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Ye Xu, Jingwen Wang, Tao Zhang, Zhihao Chen, Kaihui Xian, Zi Li, Yang-Hui Luo, Long Ye, Xiaotao Hao, Huifeng Yao, Jianhui Hou
Summary: A new alternating copolymer donor was designed for all-polymer solar cells, and the addition of a small-molecule acceptor improved the power conversion efficiency and blend morphology.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
