Significant increase of photocurrent upon UV light exposure is demonstrated in a narrow‐bandgap polymer‐based photodetector using ZnO nanoparticles as anode interfacial layer. The phenomenon is attributed to the UV light illumination induced oxygen molecules desorption from surface of ZnO nanoparticles, which reduces the electron injection barrier at the anode interface. Ultrahigh external quantum efficiency of 140 000% and extremely low gain threshold voltage of 1.5 mV are achieved in this device with 30 s UV light irradiation. The gain mechanism is explained by the fast transit and replenishment of photogenerated electrons within their lifetime, which is prolonged by the electron‐only device structure, and the experiment results fit well with the proposed photoconductive model.

High performance organic up-conversion devices are developed by integrating near infrared polymer photodetectors and tandem organic light emitting diodes.

The characteristics such as high charge carrier mobility, long diffusion length, low dark current, and sharp absorption edge of perovskites make the material ideal for realizing photodetection, that is, simultaneously fast and sensitive. However, narrow spectral (850 nm) response limits their application. Here, this study successfully demonstrates an integrated perovskite/polymer device structure based on perovskite/hybrid thin films for efficient light harvesting. The expansion of the photoresponse spectrum is achieved by selecting an appropriate low band gap polymer (poly(diketopyrrolopyrrole‐terthiophene)), which has a wider response (950 nm). It can be seen that the resulting photodetectors (PDs) yield an external quantum efficiency of ≈70% over a 500–700 nm range, and the photoresponse extends to 950 nm, which is obviously wider than the photoresponse of perovskite‐based PDs. Moreover, the dark current density of the hybrid PDs is more efficiently suppressed compared with polymer‐based PDs. The reduced dark current enhances the detectivity and linear dynamic range of the fabricated hybrid PDs, which achieve values of 1013 Jones and 110 dB, respectively.

This article reviews the development of a new category of motion sensors including linear and angular accelerometers and seismometers based on molecular electronic transducer (MET) technology. This technology utilizes a liquid not only as an inertial mass, but also as one of the main elements in the conversion of mechanical motion into electric current. The amplification process is similar to that in a vacuum triode. Therefore, it is possible to achieve signal amplification close to 108. Motion sensors demonstrating wide frequency and dynamic range and sensitivity that are one to two orders of magnitude better than MEMS devices of the same size have been developed.

We developed organic photodetectors with high photocurrent gain by enhancing the electron tunneling from the electrode owing to the effect of interface charge trapping.