Working mechanisms of photodetectors based on High a stable metal-halide perovskite nanocrystals composite with broad Frequency response
Pablo F. Betancur a, Jaume Noguera-Gómez a, Ismael Fernández-Guillen a, Teresa S. Ripolles a, Isaac Suárez a, Pablo P. Boix a
a Instituto de Ciencia de los Materiales, Universitat de València, P.O. Box 22085, 46071 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
Poster, Pablo F. Betancur, 261
Publication date: 20th April 2022

Organic-inorganic hybrid perovskite exhibits outstanding properties in light emission and photovoltaic applications, exceeding conversion efficiencies of 25%, and fast photodetection response [1]. Thus, considering the size-dependent optical and electronic properties of these materials, the use of perovskite nanocrystals helps to mitigate bulk related issues such as photoinduced halide segregation and crystal phase instability [2]. However, some challenges still need to be addressed in terms of device fabrication, particle aggregation, annealing and post-treatment related issues, and environmental instability when assembled [3]. Therefore, using a metal-organic host matrix based on a sol-gel approach [4]  as a straightforward method for the in-situ and controlled generation of highly stable perovskite nanocrystals (PNCs) stands out as a promising alternative. The optical and electrical properties of these materials are evaluated to enlighten the specific characteristics of this system concerning a perovskite polycrystalline thin film, showing photoluminescence quantum yield exceeding 80%, photocurrent response with an ON/OFF current ratio around two orders of magnitude, and remarkable stability over time when stored under room conditions. We believe that our antisolvent and glovebox-free approach for the preparation of PNCs will pave the road for its application in perovskite photodetectors, among other devices as sensors, and light emitters.

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