Multiple quantum wells (MQWs) based on thermally evaporated hybrid perovskite have been demonstrated in type-I and type-II energy band configurations by combining MAPbI₃ with bathocuproine (BCP) and lead phthalocyanine (PbPC), respectively. Their optoelectronic properties and charge dynamics have been studied, together with their device potentials. Density functional theory calculations highlighted the major role of surface-localized carriers in ultrathin MAPbI₃ and when BCP or PbPC are on top. This restrained charge exchange can reduce the band bending and minimize the disruption of band alignment, confirming the potential of these interlayer materials for MQWs. Furthermore, type-I MQWs show a remarkable increase in photoluminescence intensity (up to 50 times) and a faster radiative recombination rate as MAPbI₃ thickness decreases, demonstrating promising light emission capabilities. Type-II MQWs exhibit extended spectral sensitivity and efficient charge separation, significantly improving photodetector performance. This work sets a foundational framework for the further exploration of perovskite MQWs in light-emitting and photodetection applications.

中文翻译：

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MAPbI3 钙钛矿多量子阱用于增强光发射和检测


通过将 MAPbI ₃分别与浴铜灵 (BCP) 和铅酞菁 (PbPC) 结合，在 I 型和 II 型能带配置中展示了基于热蒸发杂化钙钛矿的多量子阱 (MQW)。人们对它们的光电特性和电荷动力学及其器件潜力进行了研究。密度泛函理论计算强调了表面局域载流子在超薄 MAPbI ₃中以及当 BCP 或 PbPC 位于顶部时的主要作用。这种受限的电荷交换可以减少能带弯曲并最大限度地减少能带排列的破坏，证实了这些中间层材料用于 MQW 的潜力。此外，随着 MAPbI ₃厚度的减小，I 型 MQW 的光致发光强度显着增加（高达 50 倍），并且辐射复合速率更快，展现出有前景的发光能力。 II 型 MQW 具有扩展的光谱灵敏度和高效的电荷分离，显着提高了光电探测器的性能。这项工作为进一步探索钙钛矿MQW在发光和光电检测应用中的应用奠定了基础框架。