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Cover Feature: Effect of TiO 2 Surface Treatment on the Current–Voltage Hysteresis of Planar‐Structure Perovskite Solar Cells Prepared on Rough and Flat Fluorine‐Doped Tin Oxide Substrates (Energy Technol. 10/2017)
Author(s) -
Cojocaru Ludmila,
Uchida Satoshi,
Jayaweera Piyankarage V. V.,
Kaneko Shoji,
Wang Haibin,
Nakazaki Jotaro,
Kubo Takaya,
Segawa Hiroshi
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700664
Subject(s) - hysteresis , materials science , perovskite (structure) , tin oxide , optoelectronics , doping , oxide , layer (electronics) , chemical engineering , nanotechnology , condensed matter physics , metallurgy , physics , engineering
Origin of I – V hysteresis in perovskite solar cells : The cover image highlights the role of interfaces in perovskite solar cells that are strongly related to the I – V hysteresis and efficiencies of CH 3 NH 3 PbI 3 ‐based cells. Accumulated photogenerated charges at the TiO 2 /CH 3 NH 3 PbI 3 interface caused by contact mismatch or/and band bending at this interface are expected to give rise to a trapping and a large recombination rate. Unbalanced charge collection and transfer create the capacitance that is the main origin of the I – V hysteresis. Such capacitance observed in perovskite solar cells is related to purely interfacial contacts. Perovskite devices prepared on flat fluorinated tin oxide (FTO) substrates showed better interfacial contacts, with small I – V hysteresis compared to the rough FTO substrates. For devices prepared on rough FTO, surface treatment of the compact TiO 2 layer with TiCl 4 and vacuum ultraviolet radiation affected the efficiency and also the I – V hysteresis, which is related to the physical contacts at this interface. More details can be found in the Communication by Ludmila Cojocaru et al. at the University of Tokyo and SPD Laboratory, Inc, Japan on page 1762 in Issue 10, 2017 (DOI: 10.1002/ente.201700308).