CH₃NH₃PbI₃ perovskite solar cells are one of the most exciting technologies in the renewable energy field, resulting in over 20% power conversion efficiency. Deep understanding of the working principle is now required to turn the high efficiency solar cells into a reliable technology. In this work we have explored the role of deposition method on the crystallinity of perovskite films and its influence on the hysteresis behavior of the current-voltage characteristics. In addition Nb₂O₅ was used as hole blocking layer and its influence is also discussed. We have found that hysteresis is strongly dependent on both; perovskite deposition method and Nb₂O₅ thickness. The ideal condition where the hysteresis is suppressed or minimized was achieved by using the sequential deposition method for the perovskite semiconductor and a hole blocking layer of 50 nm.

Date Published: 23 September 2016
PDF: 9 pages
Proc. SPIE 9936, Thin Films for Solar and Energy Technology VIII, 99360B (23 September 2016); doi: 10.1117/12.2236855

Published in SPIE Proceedings Vol. 9936:
Thin Films for Solar and Energy Technology VIII
Michael J. Heben; Mowafak M. Al-Jassim, Editor(s)