Journal
SMALL
Volume 15, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201904387
Keywords
co-doping; CsPbI2Br perovskites; Eu(Ac)(3); high efficiency; high stability
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Funding
- Fundamental Research Funds for the Central Universities [GK201603053, GK201702003] Funding Source: Medline
- National Natural Science Foundation of China [61704101, 91733301] Funding Source: Medline
- Natural Science Foundation of Shaanxi Provincial Department of Education [2017KW-023] Funding Source: Medline
- 111 Project B [14041] Funding Source: Medline
- National Key Research and Development Program of China [2016YFA0202403] Funding Source: Medline
- DNL Cooperation Fund CAS [DNL180311] Funding Source: Medline
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All-inorganic perovskite solar cells have developed rapidly in the last two years due to their excellent thermal and light stability. However, low efficiency and moisture instability limit their future commercial application. The mixed-halide inorganic CsPbI2Br perovskite with a suitable bandgap offers a good balance between phase stability and light harvesting. However, high defect density and low carrier lifetime in CsPbI2Br perovskites limit the open-circuit voltage (V-oc < 1.2 V), short-circuit current density (J(sc) < 15 mA cm(-2)), and fill factor (FF < 75%) of CsPbI2Br perovskite solar cells, resulting in an efficiency below 14%. For the first time, a CsPbI2Br perovskite is doped by Eu(Ac)(3) to obtain a high-quality inorganic perovskite film with a low defect density and long carrier lifetime. A high efficiency of 15.25% (average efficiency of 14.88%), a respectable V-oc of 1.25 V, a reasonable J(sc) of 15.44 mA cm(-2), and a high FF of 79.00% are realized for CsPbI2Br solar cells. Moreover, the CsPbI2Br solar cells with Eu(Ac)(3) doping demonstrate excellent air stability and maintain more than 80% of their initial power conversion efficiency (PCE) values after aging in air (relative humidity: 35-40%) for 30 days.
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