Gong, XiwenHuang, ZiruSabatini, RandyTan, Chih-ShanBappi, GolamWalters, GrantProppe, AndrewSaidaminov, Makhsud I.Voznyy, OleksandrKelley, Shana O.Sargent, Edward H.2025-01-232025-01-232019Gong, X., Huang, Z., Sabatini, R., Tan, C., Bappi, G., Walters, G., Proppe, A., Saidaminov, M. I., Voznyy, O., Kelley, S. O., & Sargent, E. H. (2019). Contactless measurements of photocarrier transport properties in perovskite single crystals. Nature Communications, 10(1). https://doi.org/10.1038/s41467-019-09538-7https://doi.org/10.1038/s41467-019-09538-7https://hdl.handle.net/1828/20994The remarkable properties of metal halide perovskites arising from their impressive charge carrier diffusion lengths have led to rapid advances in solution-processed optoelectronics. Unfortunately, diffusion lengths reported in perovskite single crystals have ranged widely – from 3 μm to 3 mm – for ostensibly similar materials. Here we report a contactless method to measure the carrier mobility and further extract the diffusion length: our approach avoids both the effects of contact resistance and those of high electric field. We vary the density of quenchers – epitaxially included within perovskite single crystals – and report the dependence of excited state lifetime in the perovskite on inter-quencher spacing. Our results are repeatable and self-consistent (i.e. they agree on diffusion length for many different quencher concentrations) to within± 6%. Using this method, we obtain a diffusion length in metal-halide perovskites of 2.6 μm± 0.1 μm.enAttribution 4.0 InternationalArticleDepartment of ChemistryDepartment of Electrical and Computer Engineering