Pitfalls and prospects of optical spectroscopy to characterize perovskite-transport layer interfaces

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DOI http://dx.doi.org/10.1063/1.5143121
Reference E.M. Hutter, T. Kirchartz, B. Ehrler, D. Cahen and E. von Hauff, Pitfalls and prospects of optical spectroscopy to characterize perovskite-transport layer interfaces, Appl. Phys. Lett. 116, 10: 100501: 1-8 (2020)
Group Hybrid Solar Cells

Perovskite photovoltaics has witnessed an unprecedented increase in power conversion efficiency over the last decade. The choice oftransport layers, through which photo-generated electrons and holes are transported to electrodes, is a crucial factor for further improvingboth the device performance and stability. In this perspective, we critically examine the application of optical spectroscopy to characterizethe quality of the transport layer-perovskite interface. We highlight the power of complementary studies that use both continuous wave andtime-resolved photoluminescence to understand non-radiative losses and additional transient spectroscopies for characterizing the potentialfor loss-less carrier extraction at the solar cell interfaces. Based on this discussion, we make recommendations on how to extrapolate resultsfrom optical measurements to assess the quality of a transport layer and its impact on solar cell efficiency.