Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 41, Pages 37720-37725Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12579
Keywords
inorganic perovskite; solar cells; CsPbI3; posttreatment method; phase stability
Funding
- National Basic Research Program of China [2016YFA0202401]
- 111 Project [B16016]
- National Natural Science Foundation of China [51702096, U1705256, 21403247, 51572080]
- Fundamental Research Funds for the Central Universities [2019MS027]
Ask authors/readers for more resources
Inorganic CsPbI3 perovskite has demonstrated promising potentials for photovoltaic applications, whereas the black perovskite polymorph (alpha phase) of CsPbI3 was easily prone to converting into yellow phase (delta phase) under ambient moist environment, which restrained its practical application and further studies severely. In this study, p-phenylenediammonium iodide (PPDI) was employed to posttreat CsPbI3 films for controlling the phase conversion, strengthening moisture resistance, and improving device performance. The multiple roles of PPDI were as follows: (1) avoiding spontaneous octahedral tilting by ionic bonds between NH3+ of PPD2+ and I- of [PbI6](4-); (2) enhancing the hydrophobicity induced by exactly exposed oil-wet (hydrophobic) benzene rings; and (3) passivating surface defects and filling I vacancies. As a result, after the treatment, mutable a-CsPbI3 could maintain its alpha phase for at least 30 d in dry air (<20% RH). The perovskite solar cells with PPDI treatment exhibited reproductive photovoltaic performance with a champion power conversion efficiency (PCE) of 10.4, and 91% of the initial PCE was retained after storage for 504 h in a dark dry box without any encapsulation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available