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Direct Detection of Near-Infrared Circularly Polarized Light via Precisely Designed Chiral Perovskite Heterostructures
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-02 , DOI: 10.1021/acsami.2c07208 Xinyuan Zhang 1, 2, 3 , Huang Ye 2, 3 , Lishan Liang 2 , Xinyi Niu 2 , Jianbo Wu 2, 3 , Junhua Luo 1, 2, 3, 4
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-02 , DOI: 10.1021/acsami.2c07208 Xinyuan Zhang 1, 2, 3 , Huang Ye 2, 3 , Lishan Liang 2 , Xinyi Niu 2 , Jianbo Wu 2, 3 , Junhua Luo 1, 2, 3, 4
Affiliation
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Chiral metal halide perovskites (CMHPs) have recently shown great potential for direct circularly polarized light (CPL) detection. However, owing to the limited cutoff wavelength edge of these CMHPs, most of the detectors presented thus far are characterized only in the ultraviolet and visible range; CMHPs that target at the near-infrared (NIR) region are still greatly desired. Here, we design a novel CMHP heterostructure, synthesized via solution-processed epitaxial growth of crystalline 3D MAPbI3 on a 2D chiral (R-BPEA)2PbI4 (R-BPEA = (R)-1-(4-bromophenyl)ethylammonium) crystal, and provide the first demonstration of self-powered direct NIR-CPL detection. Compared with individual chiral (R-BPEA)2PbI4, the heterostructure not only retains the spin selectivity but also allows much broader absorbance, especially beyond 780 nm, where the (R-BPEA)2PbI4 cannot absorb. Furthermore, the built-in electric potential in the heterojunction forces spontaneous separation/transport of photogenerated carriers, enabling the fabrication of devices operating without external energy supply. By making use of the abovementioned advantages, the self-powered CPL detectors of the (R-BPEA)2PbI4/MAPbI3 heterostructures hence show competitive circular polarization sensitivity at 785 nm with a high anisotropy factor of up to 0.25. In addition, a large on/off switching ratio of ∼105 and an impressive detectivity of ∼1010 Jones are also achieved. As a pioneer study, our results may broaden the material scope for future chiroptical devices based on CMHPs.
中文翻译：
通过精确设计的手性钙钛矿异质结构直接检测近红外圆偏振光
手性金属卤化物钙钛矿 (CMHP) 最近显示出用于直接圆偏振光 (CPL) 检测的巨大潜力。然而，由于这些 CMHP 的截止波长边缘有限，迄今为止提出的大多数检测器仅在紫外和可见光范围内进行表征。仍然非常需要针对近红外 (NIR) 区域的 CMHP。在这里，我们设计了一种新的 CMHP 异质结构，通过在 2D 手性 ( R -BPEA) 2 PbI 4 ( R -BPEA = ( R)-1-(4-溴苯基)乙基铵)晶体，并首次展示了自供电直接 NIR-CPL 检测。与单独的手性( R -BPEA) 2 PbI 4相比，异质结构不仅保留了自旋选择性，而且允许更宽的吸光度，特别是在( R -BPEA) 2 PbI 4不能吸收的780 nm以上。此外，异质结中的内置电势迫使光生载流子自发分离/传输，从而能够制造无需外部能源供应的器件。( R -BPEA) 2的自供电CPL探测器利用上述优点，PbI 4 /MAPbI 3异质结构因此在 785 nm 处显示出具有竞争力的圆偏振灵敏度，具有高达 0.25 的高各向异性因子。此外，还实现了~10 5的大开/关切换比和~ 10 10 Jones的令人印象深刻的检测率。作为一项开创性研究，我们的结果可能会拓宽未来基于 CMHP 的手性光学器件的材料范围。
更新日期：2022-08-02
中文翻译：
通过精确设计的手性钙钛矿异质结构直接检测近红外圆偏振光
手性金属卤化物钙钛矿 (CMHP) 最近显示出用于直接圆偏振光 (CPL) 检测的巨大潜力。然而，由于这些 CMHP 的截止波长边缘有限，迄今为止提出的大多数检测器仅在紫外和可见光范围内进行表征。仍然非常需要针对近红外 (NIR) 区域的 CMHP。在这里，我们设计了一种新的 CMHP 异质结构，通过在 2D 手性 ( R -BPEA) 2 PbI 4 ( R -BPEA = ( R)-1-(4-溴苯基)乙基铵)晶体，并首次展示了自供电直接 NIR-CPL 检测。与单独的手性( R -BPEA) 2 PbI 4相比，异质结构不仅保留了自旋选择性，而且允许更宽的吸光度，特别是在( R -BPEA) 2 PbI 4不能吸收的780 nm以上。此外，异质结中的内置电势迫使光生载流子自发分离/传输，从而能够制造无需外部能源供应的器件。( R -BPEA) 2的自供电CPL探测器利用上述优点，PbI 4 /MAPbI 3异质结构因此在 785 nm 处显示出具有竞争力的圆偏振灵敏度，具有高达 0.25 的高各向异性因子。此外，还实现了~10 5的大开/关切换比和~ 10 10 Jones的令人印象深刻的检测率。作为一项开创性研究，我们的结果可能会拓宽未来基于 CMHP 的手性光学器件的材料范围。
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