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Origin of the Enhanced Photoluminescence Quantum Yield in MAPbBr3 Perovskite with Reduced Crystal Size
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-05-21 00:00:00 , DOI: 10.1021/acsenergylett.8b00475 Nikolaos Droseros 1, 2 , Giulia Longo 3 , Jan C. Brauer 2 , Michele Sessolo 3 , Henk J. Bolink 3 , Natalie Banerji 1, 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-05-21 00:00:00 , DOI: 10.1021/acsenergylett.8b00475 Nikolaos Droseros 1, 2 , Giulia Longo 3 , Jan C. Brauer 2 , Michele Sessolo 3 , Henk J. Bolink 3 , Natalie Banerji 1, 2
Affiliation
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Methylammonium lead bromide perovskite (MAPbBr3) has been widely investigated for applications in visible perovskite light-emitting diodes (LEDs). Fine-tuning of the morphology and of the crystal size, from the microscale down to the quantum confinement regime, has been used to increase the photoluminescence quantum yield (PLQY). However, the physical processes underlying the PL emission of this perovskite remain unclear. Here, we elucidate the origin of the PL emission of polycrystalline MAPbBr3 thin films by different spectroscopic techniques. We estimate the exciton binding energy, the reduced exciton effective mass, and the trap density. Moreover, we confirm the coexistence of free carriers and excitons, quantifying their relative population and mutual interaction over a broad range of excitation densities. Finally, the enhanced PLQY upon crystal size reduction to the micro- and nanometer scale in the presence of additives is attributed to favored excitonic recombination together with reduced surface trapping thanks to efficient passivation by the additives.
中文翻译：
晶体尺寸减小的MAPbBr 3钙钛矿中增强的光致发光量子产率的起源
甲基铵溴化铅钙钛矿（MAPbBr 3）已被广泛研究用于可见钙钛矿发光二极管（LED）中。从微观尺度到量子限制机制的形态和晶体尺寸的微调已被用于增加光致发光量子产率（PLQY）。然而，仍然不清楚该钙钛矿的PL排放所基于的物理过程。在这里，我们阐明了多晶MAPbBr 3的PL发射的起源薄膜通过不同的光谱技术。我们估计激子结合能，减少的激子有效质量和陷阱密度。此外，我们确定了自由载流子和激子的共存，量化了它们的相对种群以及在广泛的激发密度范围内的相互作用。最后，在存在添加剂的情况下将晶体尺寸减小至微米和纳米级时，增强的PLQY归因于有利的激子复合以及由于添加剂的有效钝化而减少了表面俘获。
更新日期：2018-05-21
中文翻译：
晶体尺寸减小的MAPbBr 3钙钛矿中增强的光致发光量子产率的起源
甲基铵溴化铅钙钛矿（MAPbBr 3）已被广泛研究用于可见钙钛矿发光二极管（LED）中。从微观尺度到量子限制机制的形态和晶体尺寸的微调已被用于增加光致发光量子产率（PLQY）。然而，仍然不清楚该钙钛矿的PL排放所基于的物理过程。在这里，我们阐明了多晶MAPbBr 3的PL发射的起源薄膜通过不同的光谱技术。我们估计激子结合能，减少的激子有效质量和陷阱密度。此外，我们确定了自由载流子和激子的共存，量化了它们的相对种群以及在广泛的激发密度范围内的相互作用。最后，在存在添加剂的情况下将晶体尺寸减小至微米和纳米级时，增强的PLQY归因于有利的激子复合以及由于添加剂的有效钝化而减少了表面俘获。
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