Solution-Processed Ultrahigh Detectivity Photodetectors by Hybrid Perovskite Incorporated with Heterovalent Neodymium Cations
Solution-Processed Ultrahigh Detectivity Photodetectors by Hybrid Perovskite Incorporated with Heterovalent Neodymium Cations
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DOI：
10.1021/acsomega.9b01797
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发表时间：
2019-09
期刊：
影响因子：
4.1
通讯作者：
Luyao Zheng;Kai Wang;T. Zhu;Lei Liu;Jie Zheng;Xiong Gong
中科院分区：
文献类型：
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作者：
Luyao Zheng;Kai Wang;T. Zhu;Lei Liu;Jie Zheng;Xiong Gong
杂化钙钛矿材料由于其优异的光电性能而在高性能光伏领域引起了人们的广泛关注。但大多数研究都集中在原始杂化钙钛矿 CH3NH3PbI3 上。在这项研究中，我们利用新开发的 CH3NH3PbI3:xNd3+ (x = 0.5 mol%) 薄膜作为溶液处理钙钛矿光电探测器的光敏层，其中 Pb2+ 部分被异价 Nd3+ 阳离子取代。结果发现，所得的 CH3NH3PbI3:xNd3+ (x = 0.5 mol%) 薄膜具有优异的薄膜形貌、增强且平衡的载流子迁移率以及抑制的陷阱密度，从而使 CH3NH3PbI3:xNd3+ (x = 0.5 mol%) 薄膜的钙钛矿光电探测器的光电流增强并降低暗电流。因此，在室温下操作，溶液处理的钙钛矿光电探测器在 350 至 800 nm 的光谱范围内表现出超过 1014 cm Hz1/2 W–1 的光电探测能力、超过 100 dB 的线性动态范围和快速响应时间。所有这些结果表明，高性能溶液处理钙钛矿光电探测器可以通过新型杂化钙钛矿材料来实现，其中Pb2+被异价Nd3+阳离子部分取代。
Hybrid perovskite materials have drawn a remarkable attention for approaching high-performance photovoltaics owing to their superior optoelectronic properties. But most of research studies focused on the pristine hybrid perovskite CH3NH3PbI3. In this study, we utilize a newly developed CH3NH3PbI3:xNd3+ (x = 0.5 mol %) thin film, where Pb2+ is partially substituted by a heterovalent Nd3+ cation, as the photoactive layer for solution-processed perovskite photodetectors. It is found that the resultant CH3NH3PbI3:xNd3+ (x = 0.5 mol %) thin film possesses superior thin film morphology, enhanced and balanced charge carrier mobilities, and suppressed trap density, resulting in enhanced photocurrent and reduced dark current for perovskite photodetectors by the CH3NH3PbI3:xNd3+ (x = 0.5 mol %) thin film. Thus, operated at room temperature, solution-processed perovskite photodetectors exhibit over 1014 cm Hz1/2 W–1 photodetectivity in a spectrum range from 350 to 800 nm, a linear dynamic range over 100 dB, and fast response time. All these results indicate that high-performance solution-processed perovskite photodetectors can be realized by novel hybrid perovskite materials, where Pb2+ is partially substituted by heterovalent Nd3+ cations.