Self-powered broadband photodetection has evoked increased interest in next-generation photoelectronic devices. However, realizing self-powered broadband photodetection in a single material is still a challenge because of the harsh requirements, including powerful built-in field, excellent charge transport behaviors, as well as the broad absorption. Herein, we first realize broadband photodetection in the range from X-ray to UV–vis light in a polar two-dimensional perovskite (2-FBA)₂MAPb₂I₇ (2-FBA = 2-fluorobenzylamine, MA = methylamine) by incorporating an aromatic spacer into a three-dimensional prototype. As a result, (2-FBA)₂MAPb₂I₇ exhibited a superior response to UV–vis light (377 to 637 nm) without voltage bias. Specifically, a high switching ratio of 1.05 × 10⁴, an outstanding responsivity (R) of 1420 mA W^–1, and detectivity (D*) of 1.59 × 10¹³ Jones were achieved under light illumination at 520 nm. Moreover, (2-FBA)₂MAPb₂I₇ achieved a high sensitivity of 46.4 μC Gy^–1 cm^–2 without voltage bias, two times higher than that of a commercial α-Se film detector (20 μC Gy^–1 cm^–2). The sensitivity can be further improved to 3316 μC Gy^–1 cm^–2 at a 50 V bias. These results give insight into the design of 2D perovskites for self-powered broadband photodetection.

中文翻译：

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由体光伏效应诱导的极钙钛矿中从 X 射线到紫外-可见光的自供电宽带光检测


自供电宽带光探测引起了人们对下一代光电设备的兴趣。然而，由于要求苛刻，包括强大的内置场、出色的电荷传输行为以及广泛的吸收性，在单一材料中实现自供电宽带光检测仍然是一个挑战。在此，我们首先通过在三维原型中加入芳香族垫片，在极性二维钙钛矿 （2-FBA）₂MAPb₂I₇（2-FBA = 2-氟苄胺，MA = 甲胺）中实现从 X 射线到紫外-可见光范围内的宽带光检测。因此，（2-FBA）₂MAPb₂I₇ 对紫外-可见光（377 至 637 nm）表现出优异的响应，且无电压偏压。具体来说，在 520 nm 的光照下，实现了 1.05 × 10⁴ 的高开关比、1420 mA W^–1 的出色响应度 （R） 和 1.59 × 10¹³ Jones 的检测率 （D*）。此外，（2-FBA）₂MAPb₂I₇ 实现了 46.4 μC Gy^–1 cm^–2 的高灵敏度，无电压偏压，是商用 α-Se 薄膜检测器 （20 μC Gy^–1 cm^–2） 的两倍。在 50 V 偏置时，灵敏度可以进一步提高到 3316 μC Gy^–1 cm^–2。这些结果为用于自供电宽带光检测的 2D 钙钛矿的设计提供了见解。