GUEST LECTURES
Dr. Annie Ng
Assistant Professor
Department of Electrical and Computer
Engineering, Nazarbayev University
A novel cryo-controlled nucleation method
for high efficiency perovskite solar cells
Abstract
A novel cryo-controlled nucleation technique is applied to synthesize organometal halide
perovskite for solar cells (PSCs). A rapid reduction in the temperature causes a supersaturation
condition in the precursor layer, prepared by solution technique, leading to a uniform
nucleation sites for the subsequent crystallization phase. The low temperature condition
inhibits the pre-mature crystallization of perovskites in the early stage before a uniform seed
layer is formed and, thereby, decoupling the nucleation and crystallization phases. This
approach allows the formation of a highly uniform nucleation layer and is crucial for the growth
of perovskite films with excellent film quality. A power conversion efficiency (PCE) of 21.4 %
for the champion PSC was achieved by using this perovskite growth method.
The process of cryo-controlled nucleation
method and the performance of the champion
perovskite solar cell.
Reference
1. Ng, Z. Ren, H. Hu, P. W. K. Fong, Q. Shen, S. H. Cheung, P. Qin, J.-W. Lee, A. B. Djurišić, S. K. Su,
G. Li, Y. Yang, C. Surya. A cryogenic process for antisolvent-free high-performance perovskite solar
cells, Adv. Mater. (2018) DOI:10.1002/adma.201804402.