TY - JOUR
T1 - Simultaneous dual-interface and bulk defect passivation for high-efficiency and stable CsPbI2Br perovskite solar cells
AU - Zhao, Huan
AU - Xu, Zhuo
AU - Che, Yuhang
AU - Han, Yu
AU - Yang, Shaomin
AU - Duan, Chenyang
AU - Cui, Jian
AU - Dai, Songyuan
AU - Liu, Zhike
AU - Liu, Shengzhong (Frank)
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-21
PY - 2021/4/30
Y1 - 2021/4/30
N2 - All-inorganic CsPbI2Br is a promising candidate to produce the optimized balance between efficiency and stability. Unfortunately, the CsPbI2Br perovskite films prepared by solution methods often show numerous defects on the grain surfaces and a tendency for phase transition. In this work, we discovered that the proper amount of NiI2 additive enables Ni2+ doping in the perovskite interstitial lattice, while additional Ni2+ ions serve as passivation agents on the grain surfaces; in particular, a profiled distribution appears from the film bulk to both the upper and lower surfaces. The special Ni2+ distribution results in an optimized TiO2 surface for perovskite growth, better perovskite film quality, superior charge extraction capability, and effective suppression of interfacial recombination. As a result, the CsPbI2Br perovskite solar cell (PSC) efficiency is increased to 15.88%, among the highest for its type. Also, the special Ni2+ distribution endows the PSC with improved moisture tolerance. This work provides a promising strategy to overcome the surface/bulk instability issues common in PSCs.
AB - All-inorganic CsPbI2Br is a promising candidate to produce the optimized balance between efficiency and stability. Unfortunately, the CsPbI2Br perovskite films prepared by solution methods often show numerous defects on the grain surfaces and a tendency for phase transition. In this work, we discovered that the proper amount of NiI2 additive enables Ni2+ doping in the perovskite interstitial lattice, while additional Ni2+ ions serve as passivation agents on the grain surfaces; in particular, a profiled distribution appears from the film bulk to both the upper and lower surfaces. The special Ni2+ distribution results in an optimized TiO2 surface for perovskite growth, better perovskite film quality, superior charge extraction capability, and effective suppression of interfacial recombination. As a result, the CsPbI2Br perovskite solar cell (PSC) efficiency is increased to 15.88%, among the highest for its type. Also, the special Ni2+ distribution endows the PSC with improved moisture tolerance. This work provides a promising strategy to overcome the surface/bulk instability issues common in PSCs.
UR - https://linkinghub.elsevier.com/retrieve/pii/S0378775321001269
UR - http://www.scopus.com/inward/record.url?scp=85101423895&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2021.229580
DO - 10.1016/j.jpowsour.2021.229580
M3 - Article
SN - 0378-7753
VL - 492
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
