Li Chenglong, Li Weijun, Qu Wei, Hu Haijing, Zong Jia, Wei Haotong
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China.
Optical Functional Theragnostic Joint Laboratory of Medicine and Chemistry, The First Hospital of Jilin University, Changchun, 130012, P.R. China.
Adv Sci (Weinh). 2025 Feb;12(7):e2414430. doi: 10.1002/advs.202414430. Epub 2024 Dec 24.
The filterless single-pixel imaging technology is anticipated to hold tremendous competitiveness in diverse imaging applications. Nevertheless, achieving single-pixel color imaging without a filter remains a formidable challenge. Here a lead-free perovskite hemispherical photodetector is reported for filterless single-pixel color imaging. Through passivating the active vacancy and antisite defects with functional chemical groups, the trap density of the perovskite film can be dramatically reduced to half of the pristine one, which results in a stable device with 0.69 nA standard deviation (SD) of the current fluctuations for over 10 000 s. The exceptional stability and remarkable low light response capability of passivated lead-free perovskite devices ensure reliable and repeated distinguishment to high-frequency color information of Fourier patterns. High-resolution color imaging with 256 × 256 pixels can be achieved by integrating the Bayer template with Fourier patterns and designing a corresponding color restoration algorithm. Notably, its imaging quality surpasses commercial silicon photomultiplier tubes (SiPMs) under low light intensities or high-temperature conditions as demonstrated by the larger signal-to-noise ratio (SNR). This work presents a novel approach for applying perovskite photodetectors in single-pixel color imaging, propelling the advancement of filterless color imaging technology.
无滤光片单像素成像技术有望在各种成像应用中具备巨大竞争力。然而，实现无滤光片的单像素彩色成像仍然是一项艰巨的挑战。在此报道了一种用于无滤光片单像素彩色成像的无铅钙钛矿半球形光电探测器。通过用功能性化学基团钝化活性空位和反位缺陷，钙钛矿薄膜的陷阱密度可大幅降低至原始密度的一半，这使得器件在超过10000秒的时间内电流波动的标准偏差（SD）稳定在0.69 nA。钝化后的无铅钙钛矿器件具有出色的稳定性和显著的低光响应能力，确保对傅里叶图案的高频颜色信息进行可靠且重复的区分。通过将拜耳模板与傅里叶图案相结合并设计相应的颜色恢复算法，可实现256×256像素的高分辨率彩色成像。值得注意的是，在低光强度或高温条件下，其成像质量超过了商用硅光电倍增管（SiPM），这由更高的信噪比（SNR）得以证明。这项工作提出了一种在单像素彩色成像中应用钙钛矿光电探测器的新方法，推动了无滤光片彩色成像技术的发展。
