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22 August 2020 Charge diffusion and interface limited charge extraction in hybrid perovskite thin films
Ifor D. W. Samuel, Oskar Blaszczyk, Lethy Krishnan Jagadamma, Arvydas Ruseckas, Muhammad T. Sajjad
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Proceedings Volume 11474, Organic, Hybrid, and Perovskite Photovoltaics XXI; 114740O (2020) https://doi.org/10.1117/12.2569248
Event: SPIE Organic Photonics + Electronics, 2020, Online Only
Abstract
The extraction of charge from perovskite solar cells requires charge diffusion to a charge extraction layer (e.g. PEDOT:PSS), followed by charge extraction. We present a method based on time-resolved luminescence to measure charge diffusion and extraction. We find that hole transfer from methylammonium lead iodide (MAPI) to PEDOT:PSS limits the hole extraction rate, and that faster extraction is obtained by using NiO as a hole extraction layer. In addition we observe a very high hole diffusion coefficient of 2.2 cm2/s in a solution-processed MAPI film that is independent of charge density, suggesting a band-like regime of hole transport.
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Ifor D. W. Samuel, Oskar Blaszczyk, Lethy Krishnan Jagadamma, Arvydas Ruseckas, and Muhammad T. Sajjad "Charge diffusion and interface limited charge extraction in hybrid perovskite thin films", Proc. SPIE 11474, Organic, Hybrid, and Perovskite Photovoltaics XXI, 114740O (22 August 2020); https://doi.org/10.1117/12.2569248
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KEYWORDS
Diffusion
Perovskite
Interfaces
Thin films
Solar cells
Lead
Luminescence
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