Degradation Mechanisms of Perovskite Quantum Dot Photovoltaic Devices
Julius Brunner a b, Yanxiu Li a b, Miguel Albaladejo Siguan a b, Ruth Pinheiro Muniz a b, Yana Vaynzof a b
a Institute of Applied Physics, TU Dresden, Nöthnitzer Straße, 61, Dresden, Germany
b Center For Advancing Electronics Dresden (cfaed), TU Dresden, Helmholtzstraße 18, 01089 Dresden, Germany
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#PhotoPero23 - Photophysics of halide perovskites and related materials – from bulk to nano
València, Spain, 2023 March 6th - 10th
Organizers: Sascha Feldmann, Maksym Kovalenko and Jovana Milic
Poster, Julius Brunner, 322
Publication date: 22nd December 2022

Perovskite quantum dots have emerged as particularly promising candidates for application in photovoltaic devices due to their many advantageous properties. These include, for example, multiple exciton generation, bandgap tunability and exceptionally high photoluminescence quantum yield [1-3] raising significant interest in the study of perovskite quantum dots and their application in optoelectronics. Particularly noteworthy are CsPbI3 quantum dots, which when integrated into solar cells have been shown to achieve stunningly high power conversion efficiencies of over 16% [4]. However, the main drawback of CsPbI3 quantum dot solar cells is their rapid degradation both under inert and ambient conditions. While research in the field of perovskite quantum dot solar cells is predominantly focusing on the optimization of the efficiency of these devices, the fundamental understanding of the degradation mechanisms that govern the devices’ lifetime necessary for the development of suitable mitigation strategies is largely missing. In this work, we utilize a bespoke degradation setup that enables us to monitor the evolution of the properties and performance of CsPbI3 quantum dot solar cells under precisely controlled environmental conditions. These studies are complemented by a broad range of spectroscopic and microscopic techniques, thus offering valuable information regarding the degradation pathways.

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