期刊
SOLAR RRL
卷 4, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202000169
关键词
antireflections; cascaded electron transport layers; planar perovskite solar cells; short-circuit current density
资金
- National Key R&D Program of China [2018YFB1500102]
- National Natural Science Foundation of China [61974063]
- Natural Science Foundation of Jiangsu Province [BK20190315, BZ2018008]
- Thousand Talent Program for Young Outstanding Scientists in China
- Program for Innovative Talents and Entrepreneur in Jiangsu
Planar perovskite solar cells (PSCs) hold promise for simple processing at low temperatures; however, they usually show lower short-circuit current density (J(sc)) than their mesoporous counterparts owing to their higher primary optical reflection losses at the front side. The antireflective nature of a mesoporous electron transport layer (ETL) enables a low optical reflection in the front surface of solar cells, which is challenging to realize in planar PSCs. Herein, an antireflective cascaded ETL structure using SnO2/TiO2-Cl bilayers is devised to reduce optical reflection losses and to improve electrical performance in planar PSCs. The antireflective cascaded ETL results in an enhanced J(sc) of 25.4 mA cm(-2) in formamidinium lead triiodide based planar PSCs, compared with the control J(sc) of 24.6 mA cm(-2) using single-layered SnO2 ETL. A record-high J(sc) of 26.1 mA cm(-2) is further achieved using an additional antireflective coating on the front glass side, leading to a power conversion efficiency of 22.9%.
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