期刊
NANO ENERGY
卷 71, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104620
关键词
Electron transport layer; Zn2SnO4; Hierarchical nanostructure; High electron mobility; Perovskite solar cells
类别
资金
- National Science Foundation, United States [ECCS 1914562]
- China Postdoctoral Science Foundation, China [2017M612279]
- Opened Found of State Key Laboratory of Clean Energy Utilization at Zhejiang University, China [ZJUCEU2017010]
- Fundamental Research Funds of Shandong University, China [2017GN008]
- China Scholarship Council, China
Constructing electron transport layer (ETL) with higher carrier mobility and suitable bandgap is of key importance as it greatly influences the photovoltaic performance of perovskite solar cells (PSCs). Zn2SnO4 (ZTO) carries a high electron mobility of 10-30 cm(2) V-1 s(-1), an order of magnitude over the widely used TiO2 ETL in PSCs, rendering it an excellent alternative to TiO2 ETL. Herein, we report a simple yet robust polymer-templating route to interconnected, hierarchically structured, porous ZTO nanospheres as an efficient ETL for high-performance organolead halide PSCs. The porous ZTO nanospheres ETL, composed of an assembly of 4.5-nm ZTO nanoparticles on the surface of porous nanosphere possessing 80-100 nm cavity, renders markedly improved light absorption, enhanced electron extraction, facilitated charger transportation, and suppressed carrier recombination in the resulting PSCs, which exhibit a power conversion efficiency (PCE) of 17.14%, greatly outperforming the device based on the ZTO nanoparticles (14.02%; i.e., without porosity). As such, the strategy for crafting porous yet hierarchically structured semiconductors with high carrier mobility may open up an avenue to create robust ETL, and by extension, hole transport layer (HTL) for high-performance optoelectronics.
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