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Benzothieno[3,2-b]thiophene-Based Noncovalent Conformational Lock Achieves Perovskite Solar Cells with Efficiency over 24 % |
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| Authors: | Heng Zhang Xin Yu Mengjia Li Zuolin Zhang Zonglong Song Dr Xueping Zong Gongtao Duan Prof Wenfeng Zhang Prof Cong Chen Prof Wen-Hua Zhang Prof Yongsheng Liu Prof Mao Liang |
| Institution: | 1. Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Institution, Department of Applied Chemistry, Tianjin University of Technology, Tianjin, 300384 China
These authors contributed equally to this work.;2. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026 China These authors contributed equally to this work.;3. School of Material Science and Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Dingzigu Road 1, Tianjin, 300130 P. R. China;4. The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071 China;5. Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Institution, Department of Applied Chemistry, Tianjin University of Technology, Tianjin, 300384 China;6. Institute of Photovoltaic, School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500 China;7. Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650500 China |
| Abstract: | Organic semiconductors with noncovalently conformational locks (OSNCs) are promising building blocks for hole-transporting materials (HTMs). However, lack of satisfied neighboring building blocks negatively impacts the optoelectronic properties of OSNCs-based HTMs and imperils the stability of perovskite solar cells (PSCs). To address this limitation, we introduce the benzothieno3,2-b]thiophene (BTT) to construct a new OSNC, and the resulting HTM ZS13 shows improved intermolecular charge extraction/transport properties, proper energy level, efficient surface passivation effect. Consequently, the champion devices based on doped ZS13 yield an efficiency of 24.39 % and 20.95 % for aperture areas of 0.1 and 1.01 cm2, respectively. Furthermore, ZS13 shows good thermal stability and the capability of inhibiting I− ion migration, thus, leading to enhanced device stability. The success in neighboring-group engineering can triggered a strong interest in developing thienoacene-based OSNCs toward efficient and stable PSCs. |
| Keywords: | Hole Transporting Materials Noncovalent Conformational Lock Perovskite Solar Cells |