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⁻²), high pyroelectric coefficient (~6.9 μC cm⁻² K⁻¹) and figures-of-merits (F_V = 187.9 × 10⁻² cm² μC⁻¹; F_D = 881.5 × 10⁻⁵Pa^−0.5) 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.

宽带光谱光响应为各种光电器件展现了光明的前景，但实现超出材料带隙的高光活性是一个巨大的挑战。在这里，我们提出了一种分子热释电，N-异丙基苄基胺三氟乙酸酯（N -IBATFA），其宽带光热释电效应允许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 具有大的极化率（约 9.5 μC cm ^-2）、高热电系数（约 6.9 μC cm ^-2 K ^-1）和品质因数（F _V  = 187.9 × 10 ⁻² cm ² μC ⁻¹ ; F _D  = 881.5 × 10 ⁻⁵ Pa ^−0.5 ) 与最先进的热释电材料相当。特别是，这种有趣的属性赋予宽带光热释电效应，即覆盖紫外（UV，266 nm）到近红外（NIR，1950 nm）光谱范围的瞬态电流，这打破了其光学吸收的限制，从而允许宽紫外光-近红外光谱光电检测。我们的发现凸显了分子系统作为自供电宽光谱光电检测的高性能候选者的潜力。