@article{Shin2018, 
author = {Jongmoon Shin and Maengsuk Kim and Sujeong Jung and Chang Su Kim and Jucheol Park and Aeran Song and Kwun-Bum Chung and Sung-Ho Jin and Jun Hee Lee and Myungkwan Song},
title = {Enhanced efficiency in lead-free bismuth iodide with post treatment based on a hole-conductor-free perovskite solar cell},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {12},
pages = {6283-6293},
keywords = {solar cells, perovskite, band-gap engineering, bismuth halide, lead free},
url = {https://www.sciopen.com/article/10.1007/s12274-018-2151-4},
doi = {10.1007/s12274-018-2151-4},
abstract = {Despite the excellent merits of lead perovskite solar cells, their instability and toxicity still present a bottleneck for practical applications. Bismuth perovskite has emerged as a candidate for photovoltaic (PV) applications, because it not only has a low toxicity but is also stable in air. However, the power conversion efficiency (PCE) remains an unsolved problem. We performed band gap tuning experiments to improve the efficiency. The absorption of ABi3I10 structure films was extended within the visible region, and the optical band gap was decreased considerably compared to that for Cs3Bi2I9. Furthermore, we explained the correlation between the structure and the optical properties via a first-principles study. A device employing CsBi3I10 as a photoactive layer exhibits a PCE of 1.51% and an excellent ambient stability over 30 days.}
}