Author(s): Azam, M (Azam, Muhammad); Yue, SZ (Yue, Shizhong); Xu, R (Xu, Rui); Yang, SJ (Yang, Shuaijian); Liu, K (Liu, Kong); Huang, YB (Huang, Yanbin); Sun, Y (Sun, Yang); Hassan, A (Hassan, Ali); Ren, KK (Ren, Kuankuan); Tan, FR (Tan, Furui); Wang, ZJ (Wang, Zhijie); Lei, Y (Lei, Yong); Qu, SC (Qu, Shengchun); Wang, ZG (Wang, Zhanguo)

Source: ACS APPLIED MATERIALS & INTERFACES Volume: 12 Issue: 35 Pages: 39063-39073 DOI: 10.1021/acsami.0c09046 Published: SEP 2 2020

Abstract: The development of highly crystalline perovskite films with large crystal grains and few surface defects is attractive to obtain high-performance perovskite solar cells (PSCs) with good device stability. Herein, we simultaneously improve the power conversion efficiency (PCE) and humid stability of the CH3NH3PbI3 (CH3NH3 = MA) device by incorporating small organic molecule IT-4F into the perovskite film and using a buffer layer of PFN-Br. The presence of IT-4F in the perovskite film can successfully improve crystallinity and enhance the grain size, leading to reduced trap states and longer lifetime of the charge carrier, and make the perovskite film hydrophobic. Meanwhile, as a buffer layer, PFN-Br can accelerate the separation of excitons and promote the transfer process of electrons from the active layer to the cathode. As a consequence, the PSCs exhibit a remarkably improved PCE of 20.55% with reduced device hysteresis. Moreover, the moisture-resistive film-based devices retain about 80% of their initial efficiency after 30 days of storage in relative humidity of 10-30% without encapsulation.

Accession Number: WOS:000569268800022

PubMed ID: 32805927

ISSN: 1944-8244

eISSN: 1944-8252

Full Text: https://pubs.acs.org/doi/10.1021/acsami.0c09046