Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells |
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| Authors: | Yong Hui Lee Jingshan Luo Robin Humphry‐Baker Peng Gao Michael Grätzel Mohammad Khaja Nazeeruddin |
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| Affiliation: | 1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, Lausanne, Switzerland;2. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Lausanne, Switzerland;3. Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, Saudi Arabia |
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| Abstract: | The effect of the presence of unreacted PbI2 on the perovskite solar cells efficiency is reported. N,N‐Dimethylformamide vapor treatment is introduced to study the influence of complete conversion to a power conversion efficiency of the device. It is discovered that the optimized morphology of the PbI2 under layer is essential to form a dense perovskite layer preventing recombination by direct contact between TiO2 and a hole transporting layer, and to increase the charge collection efficiency. The present findings provide an insight into the morphology and growth mechanism of perovskite layer, the correlation between the device performance, and the film deposition process. |
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| Keywords: | methylammonium lead iodide PbI2 perovskite solution process two‐step method |
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