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Improving Hole‐Conductor‐Free Fully Printable Mesoscopic Perovskite Solar Cells’ Performance with Enhanced Open‐Circuit Voltage via the Octyltrimethylammonium Chloride Additive
Author(s) -
Yang Kai,
Liu Shuang,
Du Jiankang,
Zhang Weihua,
Huang Qingyi,
Zhang Wenhao,
Hu Wenjing,
Hu Yue,
Rong Yaoguang,
Mei Anyi,
Han Hongwei
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000825
Subject(s) - mesoscopic physics , perovskite (structure) , materials science , passivation , energy conversion efficiency , photovoltaic system , open circuit voltage , optoelectronics , voltage , topology (electrical circuits) , chemical engineering , nanotechnology , physics , electrical engineering , condensed matter physics , quantum mechanics , engineering , layer (electronics)
Hole‐conductor‐free fully printable mesoscopic perovskite solar cells (MPSCs) based on mp‐TiO 2 /mp‐ZrO 2 /carbon triple mesoscopic layers are competitive candidates among various rapidly developed PSCs for future photovoltaic applications due to the characteristics of low‐cost, easy upscaling, and superior stability. However, the open‐circuit voltage ( V OC ) loss in printable MPSCs is relatively large compared to that in conventional PSCs, deteriorating the power conversion efficiency (PCE). Herein, the V OC loss is reduced by the octyltrimethylammonium chloride (OTAC) additive. OTAC is found to upshift the Fermi level of TiO 2 and passivate trap states in bulk MAPbI 3 perovskite, thus optimizing the energy‐level alignment of the TiO 2 /perovskite heterojunction and suppressing nonradiative recombination in devices. As a result, MPSCs deliver the highest PCE of 16.53% with an improved V OC of 1007 mV. The work demonstrates a facile strategy to reduce the V OC loss in printable MPSCs by simultaneously optimizing the energy‐level alignment and suppressing nonradiative recombination.