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Post‐Treatment of Mesoporous Scaffolds for Enhanced Photovoltage of Triple‐Mesoscopic Perovskite Solar Cells
Author(s) -
Sheng Yusong,
Ji Wenxian,
Chu Yanmeng,
Ming Yue,
Mei Anyi,
Hu Yue,
Rong Yaoguang,
Han Hongwei
Publication year - 2020
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.202000185
Subject(s) - materials science , perovskite (structure) , mesoporous material , mesoscopic physics , energy conversion efficiency , photocurrent , optoelectronics , fabrication , nanotechnology , chemical engineering , chemistry , organic chemistry , catalysis , medicine , physics , alternative medicine , pathology , quantum mechanics , engineering
Triple‐mesoscopic perovskite solar cells (PSCs) based on TiO 2 /ZrO 2 /carbon architecture have attracted much attention due to their excellent long‐term stability and screen‐printing technique‐based fabrication process. However, the relatively low open‐circuit voltage ( V OC ) limits the further improvement of power conversion efficiency (PCE) for triple‐mesoscopic PSCs. Herein, 2‐phenyl‐5‐benzimidazole sulfonate‐Na to post‐treat the triple‐mesoscopic structured scaffold is introduced. The conduction band of the mesoporous TiO 2 layer (electron transport layer [ETL]) is significantly shifted up from −4.22 to −4.11 eV, which favors the electron transfer from the perovskite absorber to the ETL. At the same time, the recombination at the interface of ETL/perovskite is effectively suppressed. Correspondingly, the V OC and fill factor (FF) of the devices are enhanced without sacrificing the photocurrent density ( J SC ). With optimal post‐treatment conditions, the champion device delivers a V OC of 1.02 V and an FF of 0.70 with J SC of 23.06 mA cm −2 , showing an overall PCE of 16.51%. After 1000 h continuous operation at the maximum power point under AM1.5G 1 sun illumination, the devices can maintain 91.7% of the initial efficiency. This simple procedure and significant photovoltage enhancement render this method promising for fabricating efficient PSCs based on mesoporous charge transport layers.