Solution‐Processable Ultrathin Black Phosphorus as an Effective Electron Transport Layer in Organic Photovoltaics |
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| Authors: | Shenghuang Lin Shenghua Liu Zhibin Yang Yanyong Li Tsz Wai Ng Zaiquan Xu Qiaoliang Bao Jianhua Hao Chun‐Sing Lee Charles Surya Feng Yan Shu Ping Lau |
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| Affiliation: | 1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China;2. Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, P. R. China;3. Center of Super‐Diamond and Advanced Film (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, P. R. China;4. Department of Materials Science and Engineering, Monash University, Clayton, VIC, Australia;5. Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong, P. R. China |
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| Abstract: | 2D van der Waals crystals, possessing excellent electronic and physical properties, have been intriguing building blocks for organic optoelectronic devices. Most of the 2D materials are served as hole transport layers in organic devices. Here,it is reported that solution exfoliated few layers black phosphorus (BP) can be served as an effective electron transport layer (ETL) in organic photovoltaics (OPVs) for the first time. The power conversion efficiencies (PCEs) of the BP‐incorporated OPVs can be improved to 8.18% in average with the relative enhancement of 11%. The incorporation of BP flakes with the optimum thickness of ≈10 nm can form cascaded band structure in OPVs, which can facilitate electron transport and enhance the PCEs of the devices. This study opens an avenue in using solution exfoliated BP as a highly efficient ETL for organic optoelectronics. |
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| Keywords: | black phosphorus electron transport layer organic photovoltaics solution‐processable |
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