The investigation of an amidine-based additive in the perovskite films and solar cells

• Published in: Journal of semiconductors 2017, Vol.38 (1), p.48-53
• Main Authors: Zheng, Guanhaojie, Li, Liang, Wang, Ligang, Gao, Xingyu, Zhou, Huanping
• Format: Article
• Language: English
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/38/1/014001

Here,we introduced acetamidine（C2H3N2H3,Aa）-based salt as an additive in the fabrication of perovskite（CH3NH3PW3）layer for perovskite solar cells.It was found that as an amidine-based salt,this additive successfully enhanced the crystallinity of CH3NH3PW3 and helped to form smooth and uniform films with comparable grain size and full coverage.Besides,perovskite film with additive showed a much longer carrier lifetime and an obviously enhanced open-circuit voltage in the corresponding devices,indicating that the acetamidine-based salt can reduce the carrier recombination in both the film and device.We further demonstrate a promising perovskite device based on acetamidine salt by using a configuration of ITOATiO2/Perovskite/Spiro-OMeTAD/Au under 〈 150 ℃ fabrication condition.A power conversion efficiency（PCE）of 16.54%was achieved,which is much higher than the control device without acetamidine salt.These results present a simple method for film quality optimization of perovskite to further improve photovoltaic performances of perovskite solar cells,which may also benefit the exploration of A cation in perovskite materials.