 Organic photodetectors, OPDs, have attracted continuous attention due to their outstanding advantages such as tenability of detecting wavelength, low-cost manufacturing, compatibility with lightweight and flexible devices, as well as ease of processing. In this review, recent advances in device architectures and operation mechanisms of phototransistor, photoconductor, and photodiode-based OPDs are reviewed. This article was authored by Haoren, Jingdechen, Yan Qingli, and others.