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Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells
Author(s) -
Lee Yong Hui,
Luo Jingshan,
HumphryBaker Robin,
Gao Peng,
Grätzel Michael,
Nazeeruddin Mohammad Khaja
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501024
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , layer (electronics) , perovskite solar cell , chemical engineering , morphology (biology) , deposition (geology) , active layer , nanotechnology , optoelectronics , paleontology , sediment , biology , engineering , genetics , thin film transistor
The effect of the presence of unreacted PbI 2 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 PbI 2 under layer is essential to form a dense perovskite layer preventing recombination by direct contact between TiO 2 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.