Synergistic Additive's Engineering and Mechanistic Photo-Electrochemical Insights for the Development of High-Performance Tin-based Perovskite Solar Cells
Rafael S. Sánchez a, Jesús Sanchez-Díaz a, Sofia Masi a, Marie Kreĉmarová b, Agustín O. Alvarez a, Eva M. Barea a, Jesús Rodriguez-Romero c, Vladimir S. Chirvony b, Juan F. Sánchez-Royo b d, Juan P. Martinez-Pastor b d, Iván Mora-Sero a
a Institute of Advanced Materials (INAM), Universitat Jaume I, Castelló de la Plana, Castelló 12006, Spain
b Instituto de Ciencia de los Materiales, Universidad de Valencia, Valencia 46980, Spain
c Facultad de Química, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México 04510, Mexico
d MATINÉE: CSIC Associated Unit (ICMM-ICMUV of the University of Valencia), Universidad de Valencia, Valencia, Spain
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Rafael S. Sánchez, presentation 083
Publication date: 20th April 2022

Despite the promising properties of tin halide perovskites (Sn-HPs), one of the most relevant handicaps lies on the fast Sn+2 oxidation, which drastically limits the preparation of highly efficient and long-lasting photovoltaic devices. Our recent studies have also revealed a direct correlation between the halide’s reactivity and the formation of crystalline defects that detrimentally affect the device's performance, and contribute to the Sn-HP degradation. Aimed at minimizing these dramatic limitations, a synthetic procedure based on a synergistic chemical engineering approach, that consists on adding a bulky cation, together with a reducing agent which prevents premature oxidative reactions, has been developed. This strategy allows obtaining photoconversion efficiencies (PCEs) above 10% with an unprecedented stability at operating conditions. More specifically, the initial PCE remains unchanged upon 5 hours in air (60% RH) at maximum-power-point (MPP), and remarkably, 96% of the initial PCE is retained after 1300 hours at MPP in N2. To the best of our knowledge, these are the highest stability values reported for unencapsulated Sn-HP based solar cells. Interestingly, our findings demonstrate a beneficial synergistic effect when these additives are incorporated, highlight the important role of iodide on the performance upon light-soaking and ultimately, unveil mechanistic details that manifest the relevance of controlling the halides chemistry towards a successful improvement of the photovoltaics technology based on Sn-HPs.

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info