期刊
SOLAR RRL
卷 4, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202000185
关键词
alkali metals; enhanced photovoltage; perovskite solar cells; triple-mesoscopic perovskite solar cells
资金
- National Natural Science Foundation of China [91733301, 21702069]
- Fundamental Research Funds for the Central Universities
- Science and Technology Department of Hubei Province [2017AAA190]
- 111 Project [B07038]
- Program for HUST Academic Frontier Youth Team [2016QYTD06]
- China-EU Institute for Clean and Renewable Energy [ICARE-RP-2018-SOLAR-001, ICARE-RP-2018-SOLAR-002]
Triple-mesoscopic perovskite solar cells (PSCs) based on TiO2/ZrO2/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, theV(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 aV(OC)of 1.02 V and an FF of 0.70 withJ(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.
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