Organic–inorganic hybrid photodiodes (HPDs) have the potential to revolutionize optoelectronic devices for a brand-new technology. HPDs combining polymeric semiconductors and nanocrystals (NCs) have demonstrated their ability to amplify signals by trapping electrons within ligand-capped NCs. The performance of HPDs is dependent on their ability to capture minority carriers for the continuous tunneling injection of majority carriers. To achieve this, heavy-metal-free Ag₂S NCs were synthesized with stoichiometric engineering for HPDs. The surface stoichiometry of the NCs was analyzed using time-resolved photoluminescence and space-charge-limited current analyses and elemental analyses. The fine-tuning of the surface stoichiometry of Ag₂S NCs enables high external quantum efficiency (EQE) of the HPDs. The optimized HPDs demonstrated a high peak EQE of 170,000% and specific detectivity of 3 × 10¹³ Jones. Control of NC stoichiometry is vital for the photophysical properties of sensitizing centers, which guarantees successful applications of HPDs to optoelectronic devices.

中文翻译：

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Ag2S 纳米晶体的化学计量工程实现有机​​-无机混合光电二极管的高性能


有机-无机混合光电二极管（HPD）有潜力彻底改变光电器件的全新技术。结合聚合物半导体和纳米晶体 (NC) 的 HPD 已证明其能够通过在配体封端的 NC 内捕获电子来放大信号。 HPD 的性能取决于其捕获少数载流子以连续隧道注入多数载流子的能力。为了实现这一目标，通过 HPD 的化学计量工程合成了不含重金属的 Ag ₂ S NC。使用时间分辨光致发光和空间电荷限制电流分析和元素分析来分析NC的表面化学计量。 Ag ₂ S NC 表面化学计量的微调可实现 HPD 的高外量子效率 (EQE)。优化的 HPD 表现出 170,000% 的峰值 EQE 和 3 × 10 ¹³ Jones 的比探测率。 NC化学计量的控制对于敏化中心的光物理性质至关重要，这保证了HPD在光电器件中的成功应用。