Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 7, Pages 8249-8259Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21074
Keywords
perovskite solar cells; super-halogen BH4-; vacancy substitution; methylammonium immobilization; stability
Funding
- National Key Research and Development Program of China [2017YFE0133800]
- National Natural Science Foundation of China [51971002]
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Perovskite solar cells (PSCs) are susceptible to intrinsic structural instability associated with the presence of inorganic halide anions and organic cation vacancies, thus leading to the deterioration or even premature failure of devices. Herein, we develop an efficient strategy using super-halogen BH4- substitution to simultaneously immobilize methylammonium and substitute iodide vacancy for high-performance PSCs based on the dihydrogen bonding interactions. The introduced super-halogen BH4- groups not only significantly reduce the vacancy density but also effectively inhibit the decomposition of the CH3NH3+ group by forming perovskite CH3NH3PbI3-x(BH4-)(x). The power conversion efficiency (PCE) of the assembled mesoporous devices is remarkably promoted from 18.43 to 21.10%, accompanied by significant increase of both J(sc) and V-oc without obvious hysteresis. The superior PSCs can retain 90 and 80% of their initial PCE even after being stored for 1200 h under environmental conditions (50 +/- 10% RH) and 240 h at 85 degrees C in the dark, respectively. Moreover, it delivers excellent optical stability under ultraviolet illumination. This work provides an avenue to improve both the long-term stability and photovoltaic performance of PSCs.
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