Article
Energy & Fuels
Zhitao Chang, Jiahao Guo, Qiang Fu, Ting Wang, Rui Wang, Yongsheng Liu
Summary: In this study, two types of dopant-free organic semiconductor materials, ZT-H1 and ZT-H2, were successfully designed and synthesized for use as hole transport materials in perovskite solar cells. ZT-H2 showed improved hole mobility compared to ZT-H1, leading to higher efficiency and stability in the devices. The findings suggest that using a fused central core unit with extended pi-conjugation is an effective strategy for designing dopant-free HTMs for stable and efficient PSCs.
Article
Chemistry, Physical
Mohamed M. Elnaggar, Lavrenty G. Gutsev, Nikita A. Emelianov, Petr M. Kuznetsov, Lyubov A. Frolova, Sergey M. Aldoshin, Pavel A. Troshin
Summary: A comparative study of two structurally similar polytriarylamines as hole-transport layer materials for p-i-n perovskite solar cells revealed the importance of introducing methyl substituents. The study showed that introducing two methyl groups at ortho positions led to steric hindrance effects, compensated by out-of-plane rotation, while the p-methylphenyl substituent resulted in a more planar backbone. Additionally, it was demonstrated that PTA produced more compact films with better charge-transport characteristics, leading to superior solar cell efficiency.
ACS APPLIED ENERGY MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Fangwen Cheng, Fang Cao, Feng Ru Fan, Binghui Wu
Summary: This review summarizes the design strategies of common HTMs for n-i-p perovskite solar cells, discussing them comprehensively from the perspectives of additive and non-additive engineering. Critical analysis and comparison between these design strategies are provided, considering the overall power conversion efficiencies and stabilities of the solar cells. The review also provides a brief perspective on future promising design strategies for HTMs to achieve commercialization of the solar cells.
Article
Chemistry, Multidisciplinary
E. Erdenebileg, N. Tiwari, F. U. Kosasih, H. A. Dewi, L. Jia, N. Mathews, S. Mhaisalkar, A. Bruno
Summary: Metal oxides, such as non-stoichiometric nickel oxide (NiOx), have been widely used in thin film solar cells for their suitable energy band levels, high charge carrier mobilities, and excellent stability. In this study, we demonstrate the fabrication of co-evaporated perovskite solar cells (PSCs) with sputtered NiOx as the hole transport layer. We investigate the impact of sputtering conditions on the physical properties of NiOx and achieve highly efficient PSCs using optimized conditions.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Energy & Fuels
Isidora Susic, Kassio P. S. Zanoni, Abhyuday Paliwal, Ismail C. Kaya, Zafer Hawash, Michele Sessolo, Ellen Moons, Henk J. Bolink
Summary: This study investigates the characteristics of thin hole transport layers (HTLs) in vacuum-deposited perovskite solar cells. It is found that only very thin HTLs (<5 nm) result in high-performing devices, while thicker films (>= 5 nm) exhibit dynamic behavior in consecutive electrical measurements. Furthermore, small-molecule HTLs are found to lead to thermally unstable solar cells, possibly due to chemical reactions/diffusion at the interface with the perovskite layer.
Article
Polymer Science
Jae Woong Jung, Seung Hwan Son, Jun Choi
Summary: The study demonstrates that the polyaniline composite film has enhanced electrical conductivity and suitable energy level matching with CH3NH3PbI3 to improve the photovoltaic properties of the device. The composite film-based devices achieved a maximum efficiency of 16.61%, which is 21.6% higher than the device with pristine polyaniline. Additionally, the reduced graphene oxide-based composite film showed superior long-term stability compared to the pristine polyaniline-based device, indicating great potential for high performance perovskite solar cells.
Article
Materials Science, Composites
Se-Phin Cho, Geul Han, You-Hyun Seo, Yong-Jin Noh, Joon-Yong Sohn, In-Tae Hwang, Junhwa Shin, Chan-Hee Jung, Seok-In Na
Summary: This research demonstrates that a solution-processable reduced graphene oxide/poly (N-vinylpyrrolidone) nanocomposite (rGO/PVP) can serve as an effective hole-transport layer (HTL) in perovskite solar cells (PeSCs), outperforming traditional graphene nanoflakes (GNFs) and poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS). The rGO/PVP composite, easily producible via cost-effective electron beam technology, shows promising potential for long-lasting high-performance PeSCs.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Qinrong Cheng, Haiyang Chen, Weijie Chen, Junyuan Ding, Ziyuan Chen, Yunxiu Shen, Xiaoxiao Wu, Yeyong Wu, Yaowen Li, Yongfang Li
Summary: This paper investigates the use of dopant-free hole transport layers (HTLs) in perovskite solar cells. By designing a novel organic small molecule, BDT-C8-3O, the researchers achieved high solubility and crystallinity in green solvents, resulting in world-record power conversion efficiencies and remarkable operational stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Yikai Wang, Qiaoyun Chen, Jianfei Fu, Zhengxu Liu, Zhe Sun, Shuai Zhang, Yuanyuan Zhu, Xuguang Jia, Jing Zhang, Ningyi Yuan, Yi Zhou, Bo Song, Yongfang Li
Summary: In this study, a novel small molecule Hole transport material (HTM) was synthesized and successfully applied in p-i-n perovskites solar cells (Pero-SCs) without the need for doping and thermal annealing. The corresponding devices achieved a high power conversion efficiency (PCE) of 21.23%, with a high open-circuit voltage and fill factor. Additionally, the study revealed that the annealing temperature of the material affects the device performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Hui Ma, Ligang Yuan, Qiaoyun Chen, Jianfei Fu, Jiajia Zhang, Zhixuan Jiang, Bin Dong, Yi Zhou, Shouchun Yin, Bo Song
Summary: Recent research has focused on developing efficient organic-inorganic halide perovskite solar cells with block copolymers as hole transport layers (HTLs) that do not require doping or thermal annealing. This approach has resulted in high power conversion efficiencies (PCEs) for Pero-SCs, with devices exhibiting high tolerance to moisture and heat.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Review
Chemistry, Multidisciplinary
Xuning Zhang, Hong Zhang, Yanxun Li, Saud-uz Zafar, Shuo Yang, Jianhui Chen, Huiqiong Zhou, Yuan Zhang
Summary: Organic solar cells (OSCs) have experienced rapid improvement in power conversion efficiency (PCE) due to advances in materials and device engineering. The choice of buffer layer materials for interface charge transport and collection is critical to optimize PCE. While hole transport layers (HTLs) have received less attention compared to electron transport layers (ETLs), the commercial material PEDOT:PSS has limitations for efficiency and stability enhancement. This review summarizes recent progress in HTL materials, including modifications to PEDOT:PSS and alternative materials based on polymers and inorganic oxides, and provides an outlook on the possibilities and challenges in this field.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Polymer Science
Tian Yuan, Jin Li, Shimin Wang
Summary: By in-situ polymerization of 3,4-ethylenedioxythiophene monomers on the surface of graphene oxide, a PEDOT-GO film is formed as a hole transport layer (HTL) to lower the cost and avoid corrosion of the perovskite and the use of solvent. The highest power conversion efficiency (PCE) achieved is 14.09%.
Article
Chemistry, Multidisciplinary
Qinrong Cheng, Haiyang Chen, Fu Yang, Ziyuan Chen, Weijie Chen, Heyi Yang, Yunxiu Shen, Xue-Mei Ou, Yeyong Wu, Yaowen Li, Yongfang Li
Summary: Researchers propose a molecular assembly strategy to improve the optoelectronic properties of organic hole transport materials (HTMs) in perovskite solar cells. The resulting cells show promising efficiency and long-term stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Xinxin Zhang, Tianyu Xu, Ziqi Tian, Xiang He, Shengxiong Zhang, Ling Ai, Wenjun Zhang, Shiyong Liu, Weijie Song
Summary: In this study, we synthesized three soluble perinone isomers as electron transport materials in p-i-n perovskite solar cells. The cis-isomer BBIN-2 showed higher LUMO level and electron mobility compared to the trans-isomers. The BBIN-2 devices demonstrated the highest power conversion efficiency of 19.36%, highlighting the potential of perinone dyes in perovskite solar cells.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Ahmed Farag, Thomas Feeney, Ihteaz M. Hossain, Fabian Schackmar, Paul Fassl, Kathrin Kuester, Rainer Baeuerle, Marco A. Ruiz-Preciado, Mario Hentschel, David B. Ritzer, Alexander Diercks, Yang Li, Bahram Abdollahi Nejand, Felix Laufer, Roja Singh, Ulrich Starke, Ulrich W. Paetzold
Summary: Engineering of the interface between perovskite absorber thin films and charge transport layers has significantly advanced perovskite solar cell (PSC) technology. The use of self-assembled monolayers (SAM-HTLs) as hole transport layers has led to almost lossless contacts, improving power conversion efficiency. This study demonstrates the successful vacuum-based evaporation of carbazole-based SAM-HTLs, which exhibit comparable performance to solution-processed counterparts, and also improves perovskite wetting and fabrication yield.
ADVANCED ENERGY MATERIALS
(2023)