Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 2, Pages 2619-2625Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05653
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Funding
- National Natural Science Foundation of China [51502141, 91433203, 61474049, 21702069]
- Ministry of Science and Technology of China (863) [2015AA034601]
- Fundamental Research Funds for the Central Universities
- Science and Technology Department of Hubei Province [2017AAA190]
- 111 Project [B07038]
- China Postdoctoral Science Foundation [2017M612452]
- 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]
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Printable perovskite solar cells (PSCs) have attracted widespread attention due to the simple fabrication process and low-cost raw materials. However, because no hole transport material is used and the carbon layer possess a relatively low work function of only 4.8-5.0 eV, a significant potential loss exists in printable PSCs, resulting in a relatively low open-circuit voltage (V-OC). We employed vanadium oxide (VO') to post-treat the interface of carbon/perovskite, and effectively enhanced the photovoltage and PCE of printable PSCs. VOx possesses a high work function of similar to 5.39 eV, and thus can facilitate the charge transfer from perovskite to carbon due to a more favorable energy level alignment. The Voc of the devices can be enhanced from similar to 892.73 to similar to 922.86 mV, delivering an average PCE of 14.47% and a champion PCE of 15.77%. In addition, this post-treatment method can also suppress the hysteresis of printable PSCs. The hysteresis index was reduced from 0.025 to -0.001 with VOx treated cells. This VOx post-treatment method is simple, easy to operate and compatible with various perovskite absorbers in printable PSCs, providing a promising prospect for further applications.
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