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On the Role of Interfaces in Planar‐Structured HC(NH 2 ) 2 PbI 3 Perovskite Solar Cells
Author(s) -
Seol DongJin,
Lee JinWook,
Park NamGyu
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201403442
Subject(s) - photocurrent , perovskite (structure) , materials science , photoluminescence , surface photovoltage , grain size , planar , deposition (geology) , photovoltaic system , energy conversion efficiency , chemical engineering , analytical chemistry (journal) , nanotechnology , mineralogy , crystallography , chemistry , optoelectronics , metallurgy , spectroscopy , paleontology , physics , computer graphics (images) , quantum mechanics , sediment , computer science , engineering , ecology , chromatography , biology
Planar‐structured HC(NH 2 ) 2 PbI 3 (FAPbI 3 ) perovskite solar cells were prepared via a two‐step deposition process. To investigate the role of interface, the perovskite morphology was intentionally modified by varying HC(NH 2 ) 2 I concentration. Surface and grain sizes of the deposited FAPbI 3 became rougher and larger as the HC(NH 2 ) 2 I concentration decreased from 58.2 to 40.7 m M . Average photocurrent was improved but photovoltage deteriorated slightly with decreasing concentration. Consequently, the average efficiency was improved from 7.82 % to 10.70 % and the best efficiency of 12.17 % was obtained at 40.7 m M . Photoluminescence (PL) at TiO 2 /FAPbI 3 interface was reduced with decreasing concentration, which was, however, reversed at FAPbI 3 /spiro‐MeOTAD one. By correlating PL data and the photovoltaic performance, we concluded that the TiO 2 /perovskite interface plays a crucial role in determining photocurrent while the perovskite/spiro‐MeOTAD interface is important in governing photovoltage.