Zeng Xi, Liu Yi, Weng Wen, Hua Lina, Tang Liwei, Guo Wuqian, Chen Yaoyao, Yang Tian, Xu Haojie, Luo Junhua, Sun Zhihua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
University of Chinese Academy of Sciences, Beijing, 100039, China.
Nat Commun. 2023 Sep 19;14(1):5821. doi: 10.1038/s41467-023-41523-z.
Broadband spectral photoresponse has shown bright prospects for various optoelectronic devices, while fulfilling high photoactivity beyond the material bandgap is a great challenge. Here, we present a molecular pyroelectric, N-isopropylbenzylaminium trifluoroacetate (N-IBATFA), of which the broadband photo-pyroelectric effects allow for self-driven wide spectral photodetection. As a simple organic binary salt, N-IBATFA possesses a large polarization (9.5 μC cm), high pyroelectric coefficient (6.9 μC cm K) and figures-of-merits (F = 187.9 × 10 cm μC; F = 881.5 × 10Pa) comparable to the state-of-art pyroelectric materials. Particularly, such intriguing attributes endow broadband photo-pyroelectric effect, namely, transient currents covering ultraviolet (UV, 266 nm) to near-infrared (NIR, 1950 nm) spectral regime, which breaks the restriction of its optical absorption and thus allows wide UV-NIR spectral photodetection. Our finding highlights the potential of molecular system as high-performance candidates toward self-powered wide spectral photodetection.
宽带光谱光响应在各种光电器件中展现出了光明的前景，然而，要实现超越材料带隙的高光活性却是一项巨大的挑战。在此，我们展示了一种分子热释电材料——N-异丙基苄基三氟乙酸铵（N-IBATFA），其宽带光热释电效应可实现自驱动的宽光谱光电探测。作为一种简单的有机二元盐，N-IBATFA具有较大的极化强度（约9.5 μC/cm）、较高的热释电系数（约6.9 μC/cm²·K）以及与现有热释电材料相当的品质因数（F = 187.9×10⁻⁴ cm²/μC；F = 881.5×10⁻⁴ Pa）。特别地，这些引人注目的特性赋予了其宽带光热释电效应，即瞬态电流覆盖从紫外（UV，266 nm）到近红外（NIR，1950 nm）的光谱范围，这打破了其光吸收的限制，从而实现了宽紫外-近红外光谱范围的光电探测。我们的发现凸显了分子体系作为高性能自驱动宽光谱光电探测候选材料的潜力。
