TY  - JOUR
AU  - Wang, Mengxuan
AU  - Lou, Yunjie
AU  - Bai, Xintao
AU  - Ren, Ziqiu
AU  - Song, Yanlin
AU  - Gu, Zhenkun
PY  - 2026
TI  - Fluorophenylalkylamine passivation of α-FAPbI3 for high-performance and air-stable photodetectors
JO  - Nano Research
SN  - 1998-0124
SP  - 94908476
VL  - 19
IS  - 4
AB  - Formamidinium–lead triiodide (FAPbI3) shows strong potential for high-performance photodetectors owing to its narrow band gap and superior thermal stability. However, fabrication of pure-phase α-FAPbI3 via a simple method remains challenging. Herein, a facile strategy based on antisolvent engineering is introduced to obtain pure-phase FAPbI3 perovskite films by incorporating 3,5-difluorobenzylamine (DFBZ) into one-step antisolvent chlorobenzene. The findings reveal that the DFBZ molecule can effectively control the crystallization of perovskite and improve α phase stability of FAPbI3 perovskite. The perovskite films incorporating DFBZ exhibit a more uniform and denser surface morphology as well as prolonged carrier lifetime. The resulting photodetectors demonstrate a broad spectral response from 300 to 850 nm, with a responsivity of up to 0.49 A·W−1 at 770 nm. The DFBZ molecule can effectively passivate perovskite crystal defects and also improve the stability of perovskite films. The optimized devices retain approximately 90% of their initial performance after storage in air environment of 25 °C and a relative humidity of 30% for 400 h. The strategy provides an effective route to prepare stable pure-phase α-FAPbI3 perovskite films and broadband photodetectors.
UR  - https://doi.org/10.26599/NR.2026.94908476
DO  - 10.26599/NR.2026.94908476