Highly sensitive broadband photomultiplication type all-polymer photodetectors and their applications in optical pulse counting

Abstract

Broadband photomultiplication type all-polymer photodetectors (PM-APDs) are achieved on the basis of ITO/PFN-Br/PBDB-T:PYF-T-o (3:100, wt/wt)/LiF/Au as the configuration. Amounts of isolated hole traps are formed with PBDB-T encircled by PYF-T-o...

Synergistically enhanced wide spectrum photodetection of a heterogeneous trilayer CsPbI3/PbS/ZnO architecture

“…The response time of the photodetector is generally defined as the time required for the photocurrent to rise or fall to a steady value as the light is switched on or off, which can be calculated from the time periods for photocurrent from 10% to 90% (90% to 10%) of the maximum photocurrent at the rising(falling) edge. 48 As shown in Fig. 4g-l, under 1 mW cm À2 light illumination with 2 seconds on/off time, the CsPbI 3 /PbS/ZnO photodetectors exhibit excellent on/off characteristics and repeatability at three representative wavelengths, and the photocurrent shows no degradation in 4 on/off cycles; the repeatability is also an important parameter to evaluate the stability and service life of photodetectors.…”

Heterointerface engineering of tetragonal CsPbCl3 based ultraviolet photodetectors with pentacene for enhancing the photoelectric performance

“…3e and f. In the range of low light intensities, the spectra show a highly linear increasing trend with peak R, D*, and EQE values of 243 mA W À1 , 2.03 Â 10 13 Jones, and 80.2%, benefiting from the capability of weak-light detection. 59 Then, all the above parameters decreased exponentially with an increase in incident light densities, which resulted from the enhanced carrier recombination when more carriers are generated and accumulated in the CsPbCl 3 film under high light intensities.…”

“…Visible blind photodetectors which convert ultraviolet (UV) optical signals into electronic signals are of great importance for imaging systems, 1 biological sensors, 2 medical analysis, 3 astronomical observation, 4 military monitoring, 5 and so forth. 6–8 Several eminent semiconductor materials including GaN, 9 Ga 2 O 3 , 10 ZnO, 11 diamond 12 and organic materials 13–16 have witnessed enormous advances in the application of broadband or narrowband visible blind UV photodetectors. However, the performance enhancement of the devices based on these materials is seriously restricted by their either sophisticated and expensive approaches or imperfect material characteristics.…”

Double-Layered Strategy for Broadband Photomultiplication-Type Organic Photodetectors and Achieving Narrowband Response in Violet, Red, and Near-Infrared Light

“…The J D of PM-OPDs is obviously suppressed along with the AL thickness increasing, which should be due to the leakage current decreasing. The rather low leakage current can be achieved in thick active layers, mainly benefiting from the enhanced charge transfer resistance (RCT) of active layers. − To further explore the underlying reason for J D suppression, electrochemical impedance spectroscopy of PM-OPDs with different thicknesses of AL was measured in the dark condition, as displayed in Figure S3. The RCT of the active layers can be estimated according to the diameter of the semicircle.…”