Decoupling the effects of defects on efficiency and stability through phosphonates in stable halide perovskite solar cells

By Haibing Xie, Zaiwei Wang, Zehua Chen, C. Pereyra, M. Pols, K. Gal̷kowski, M. Anaya, Shuai Fu, Xiaoyu Jia, Pengyi Tang and 20 more. 2021

154 citations recorded by the source corpus.

Summary Understanding defects is of paramount importance for the development of stable halide perovskite solar cells (PSCs). However, isolating their distinctive effects on device efficiency and stability is currently a challenge. We report that adding the organic molecule 3-phosphonopropionic acid (H3pp) to the halide perovskite results in unchanged overall optoelectronic performance while having a tremendous effect on device stability. We obtained PSCs with ∼21% efficiency that retain ∼100% of the initial efficiency after 1,000 h at the maximum power point under simulated AM1.5G illumination. The strong interaction between the perovskite and the H3pp molecule through two types of hydrogen bonds (H…I and O…H) leads to shallow point defect passivation that has a significant effect on device stability but not on the non-radiative recombination and device efficiency. We expect that our work will have important implications for the current understanding and advancement of operational PSCs.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5262a5ce4b23300e3e78080344555b2805158dcc