▷ 제목: Insights into Charge Carrier Dynamics in Metal Halide Perovskites

▷ 내용: It is important to understand the long-range charge transport within the metal halide perovskite for optimisation of operating devices, where the charges have to travel over on the order of microns, and if these properties change in different carrier density regimes, or through different methods of processing the films. Here this presentation introduces applied methodologies and also highlights an advanced optical and electrical methodologies: Pulsed-voltage space charge limited current (PV-SCLC)[1], Dynamic trapping model (TRPL)[2], Photoinduced transmission and reflection (PITR)[3], Transient photo-conductivity (TPC)[4,5]. With these methods, we accurately estimated the internal free-carrier density during photo-excitation, accounting for both early-time recombination and exciton-to-free-carrier branching ratios to determine long-range charge carrier mobility in metal halide perovskite thin films and single crystals, to be reliable value over many orders of magnitude of charge density. We believe this study is the accurate evaluation of photo-induced long-range mobility of metal halide perovskites, and therefore represents a powerful handle for future optimisation of perovskite solar cells and optoelectronic devices

Keywords— metal halide perovskite, photovoltaics, optoelectronics, laser spectroscopy, energy materials

1. J. Lim* et al., ACS Energy Letters 5, 376 (2020)

2. J. Lim* et al., Journal of Materials Chemistry A, 7, 25838 (2019)

3. J. Lim* et al., Energy & Environmental Science, 12, 169 (2019)

4. J. Lim* et al., Nature Communications, 13, 4210 (2022)

5. J. Lim* et al., Advanced Functional Materials, 32, 2203064 (2022)