期刊
ACS ENERGY LETTERS
卷 3, 期 4, 页码 970-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00270
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资金
- National Key Research and Development Program of China MOST [2017YFA0204800]
- National Natural Science Foundation of China [61704099/61674098]
- Fundamental Research Funds for the Central Universities [GK201703026/GK201603054]
- China Post-doctoral Science Foundation [2016M602759/2017M613052]
- Shaanxi Province Postdoctoral Science Foundation [2017BSHYDZZ04]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ2038]
- Changjiang Scholar and Innovative Research Team [IRT_14R33]
- Chinese National 1000-talent-plan program [1110010341]
It is imperative to develop a large-aspect-ratio grain-based thin film with low trap density for high-performance inorganic perovskite CsPbI2Br solar cells. Herein, by using Mn2+ ion doping to modulate film growth, we achieved CsPbI2Br grains with aspect ratios as high as 8. It is found that Mn2+ ions insert into the interstices of the CsPbI2Br lattice during the growth process, leading to suppressed nucleation and a decreased growth rate. The combination aids in the achievement of larger CsPbI2Br crystalline grains for increased J(SC) values as high as 14.37 mA/cm(2) and FFs as large as 80.0%. Moreover, excess Mn2+ ions passivate the grain boundary and surface defects, resulting in effectively decreased recombination loss with improved hole extraction efficiency, which enhances the built-in electric field and hence increases V-OC to 1.172 V. As a result, the champion device achieves stabilized efficiency as high as 13.47%, improved by 13% compared with only 11.88% for the reference device.
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