Perovskite solar cells: from efficiency to stability
Liyuan Han a
a State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China.
b College of Arts and Sciences, University of Tokyo
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Invited Speaker, Liyuan Han, presentation 027
Publication date: 21st November 2022

Highly efficient and low-cost perovskite solar cells (PSCs), one of the most promising next-generation photovoltaic technology, triggered intensive research around the world. Up till now, PSCs have achieved the record power conversion efficiency of 25.7% and the device stability has been improved substantially. To push forward the development of PSCs, researchers from home and abroad have been overcoming the obstacles of commercialization. According to our estimation of the levelized cost of electricity, the key to future applications is to reduce the cost of PSCs which strongly depend on high efficiency and long stability. In this presentation, I will introduce our recent works on promoting the efficiency and stability of PSCs from aspects of crystallization, passivation, and ion-migration blocking.

We introduced a perovskite crystal array (PCA) with regular distribution to assist the growth of the perovskite absorption layer. The PCA provided nuclei where the crystallization can commence without overcoming the critical Gibbs free energy for nucleation and induces a controllable bottom-up crystallization process under solvent annealing. As a result, the device achieved power conversion efficiency of over 25.1%. Furthermore, we constructed a composite electrode of copper-nickel (Cu-Ni) alloy stabilized by in situ grown bifacial graphene. The device with the copper-nickel electrode showed an efficiency of 24.34% (1cm2) and stability: 95% of their initial efficiency is retained after 5,000 hours at maximum power point tracking under continuous 1 sun illumination.

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