Electronic traps and phase segregation in lead mixed-halide Perovskite
ACS Energy Letters American Chemical Society 4:1 (2018) 75-84
Abstract:
An understanding of the factors driving halide segregation in lead mixed-halide perovskites is required for their implementation in tandem solar cells with existing silicon technology. Here we report that the halide segregation dynamics observed in the photoluminescence from CH3NH3Pb(Br0.5I0.5)3 is strongly influenced by the atmospheric environment, and that encapsulation of films with a layer of poly(methyl methacrylate) allows for halide segregation dynamics to be fully reversible and repeatable. We further establish an empirical model directly linking the amount of halide segregation observed in the photoluminescence to the fraction of charge carriers recombining through trap-mediated channels, and the photon flux absorbed. From such quantitative analysis we show that under pulsed illumination, the frequency of the modulation alone has no influence on the segregation dynamics. Additionally, we extrapolate that working CH3NH3Pb(Br0.5I0.5)3 perovskite cells would require a reduction of the trap-related charge carrier recombination rate to ≲105s–1 in order for halide segregation to be sufficiently suppressed.Publisher Correction: High irradiance performance of metal halide perovskites for concentrator photovoltaics
Nature Energy Springer Nature America, Inc (2018)
Abstract:
© 2018, Springer Nature Limited. When this Article was originally published, an old version of the associated Supplementary Information file was uploaded. This has now been replaced.Raman Spectrum of the Organic-Inorganic Halide Perovskite CH3NH3PbI3 from First Principles and High-Resolution Low-Temperature Raman Measurements
JOURNAL OF PHYSICAL CHEMISTRY C 122:38 (2018) 21703-21717
Engineering semiconductor nanowires for photodetection: from visible to terahertz
SPIE, the international society for optics and photonics 10729 (2018) 1072909
The effects of doping density and temperature on the optoelectronic properties of formamidinium tin triiodide thin films
Advanced Materials Wiley 30:44 (2018) 1804506