Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 32, Pages 36228-36236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11047
Keywords
all-inorganic perovskite solar cells; CsPbI2Br; additive; methylammonium iodide; stability
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2017R1C1B2009691]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2017H1D8A2031138]
- National Research Foundation of Korea [2017R1C1B2009691, 22A20130000119] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A high-quality perovskite film is a key aspect contributing to high photovoltaic performance of all-inorganic perovskite solar cells. We herein demonstrate that the addition of methylammonium iodide (MAI) influences effectively both the tailored film morphology and precise crystal growth to construct high-quality CsPbI2Br films. It is found that an MAI additive retards the crystallization kinetics to control the inorganic perovskite films to form a highly crystalline alpha-CsPbI2Br structure consisting of microsized grains with reduced defect density. The optimal MAI additive (10 wt %) achieves a power conversion efficiency (PCE) of 10.40% for the CsPbI2Br-based all-inorganic perovskite solar cells, which is >30% enhancement from 6.95% of the pristine one. The solar cells employing the MAI additive possess high operational and thermal stability, retaining >70% of the original PCE after aging for 1500 h in ambient atmosphere and under continuous heating at 85 degrees C for 30 h, respectively. The photovoltaic performance with an indoor light source was also examined using a white light-emitting diode (6500 K, 1000 lux), showing promising PCEs of 23.51% with a stabilized power output of 21.15%.
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