Herein, we demonstrated a surface-passivated Ag/CdS/Ag photodetector device fabricated using nanocrystalline CdS thin films deposited via the spray pyrolysis method. Surface passivation with nitrocellulose enhances the photosensitivity by 26,000 times and reduces the rise/decay time substantially to 0.4/0.6 ms. The rise in photosensitivity and ultrafast photoresponse time of the nitrocellulose-coated photodetector, as compared with the uncoated photodetector (27 and 1.4 ms), are due to the suppression of the surface sulfur vacancy defects, thus increasing the concentration of photogenerated free carriers.

中文翻译：

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硝酸纤维素表面钝化增强CdS薄膜的可见光光响应

在这里，我们展示了一种表面钝化的Ag / CdS / Ag光电探测器，该器件使用通过喷雾热解法沉积的纳米CdS薄膜制成。用硝化纤维素进行的表面钝化可将光敏性提高26,000倍，并将上升/下降时间基本上减少至0.4 / 0.6 ms。与未涂覆的光电检测器相比，涂覆硝酸纤维素的光电检测器的光敏性和超快光响应时间的增加（分别为27和1.4 ms）是由于抑制了表面硫空位缺陷，从而增加了光生自由载流子的浓度。