Efficient and non-hysteresis CH3NH3PbI3/PCBM planar heterojunction solar cells |
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| Affiliation: | 1. Institute of Super-microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha 410083, Hunan, China;2. Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, Hunan, China;3. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;4. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA;1. Center for Nano-Photonics Convergence Technology, Korea Institute of Industrial Technology, 500-480 Gwangju, Republic of Korea;2. Division of Microelectronic and Display Technology, Wonkwang University, Iksan, Jeollabukdo 500-749, Republic of Korea;1. Los Alamos National Laboratory, Los Alamos, NM 87545, USA;2. Department of Physics, Shandong University, Jinan 250100, China;3. University of Minnesota, Minneapolis, MN 55455, USA |
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| Abstract: | Highly efficient and non-hysteresis organic/perovskite planar heterojunction solar cells was fabricated by low-temperature, solution-processed method with a structure of ITO/PEDOT:PSS/CH3NH3PbI3/PCBM/Al. The high-quality perovskite thin film was obtained using a solvent-induced-fast-crystallization deposition involving spin-coating the CH3NH3PbI3 solution followed by top-dropping chlorobenzene with an accurate control to induce the crystallization, which results in highly crystalline, pinhole-free, and smooth perovskite thin film. Furthermore, it was found that the molar ratio of CH3NH3I to PbI2 greatly influence the properties of CH3NH3PbI3 film and the device performance. The equimolar or excess PbI2 was facile to form a flat CH3NH3PbI3 film and produced relatively uniform perovskite crystals. Perovskite solar cells (PSCs) with high-quality CH3NH3PbI3 thin film showed good performance and excellent repeatability. The power conversion efficiency (PCE) up to 13.49% was achieved, which is one of the highest PCEs obtained for low-temperature, solution-processed planar perovskite solar cells based on the structure ITO/PEDOT:PSS/CH3NH3PbI3/PC61BM/Al. More importantly, PSCs fabricated using this method didn’t show obvious hysteresis under different scan direction and speed. |
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| Keywords: | Planar heterojunction Low temperature Perovskite solar cells Hysteresis |
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