Antioxidant induced bulk passivation for efficient and stable hole transport layer-free carbon electrode perovskite solar cells |
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| Affiliation: | 1. Key Laboratory of Chemical Reaction Engineering of Shaanxi Province, College of Chemistry & Chemical Engineering, Yan''an University, Yan''an 716000, China;2. Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, Xi''an 710062, China;1. School of Materials Science and Engineering, Shaanxi Normal University, Xi''an 710119, China;2. School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi''an 710021, China |
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| Abstract: | Defect passivation is one of the important strategies to improve the efficiency and stability of perovskite solar cells. In this work, 2,6-di‑tert‑butyl‑4-methylphenol (BHT) as antioxidant was introduced into the perovskite precursor solution to improve the quality of the prepared perovskite films, so that these films performed a larger and uniform grain size. Moreover, the −OH functional group in BHT interacts with I−, thus reducing the density of defect states and inhibiting the non-radiative recombination. The presence of hydrophobic groups in BHT protects the film from moisture erosion and improves the long-term stability of PSCs devices. The maximum photoelectric conversion efficiency of the constructed ITO/SnO2/BHT-MAPbI3/Carbon device is 16.88%, and the unpackaged cell maintains the initial efficiency of 99.3% after 698 h of storage under the environmental condition of 30% humidity. This work provides an efficient approach to improve the performance of printable hole transport layer-free carbon electrode perovskite solar cells. |
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