| We report some optoelectronic devices,such asefficientorganic solar cells based on P3HT:PC71BM,perovskite solar cells(PSCs)based on PCBM([6,6]-phenyl-C71-butyric acid methyl ester)modified ZnO nanorod arrays and photodetectors based on ZnO nanorods/CH3NH3PbI3/MoO3.Via a solvent annealing process and a thermal annealing treatmeant to the active layer P3HT:PC71BM,we enhanced the crystallinity of P3HT,thereby improving the performance of organicsolar photovoltaic cell;PCBM was used to modify the ZnO nanorod arrays in the PSC,which improved the performance of PSC based on ZnO nanorod arrays effectively;ZnO nanorods and CH3NH3PbI3 were first combined to prepare a detector,and a hole transport layer MoO3 of optimum thickness was also used to further enhance the detection performance of the photodetector.We have done a detailed description to the preparation,characterization and testing of three devices,and via improving the experimental processes and modification to optimize the devices performance.The details were following:1.For the efficient polymer solar cell,we control the solvent annealing process and thermal annealing treatmeant of the active layer P3HT:PC71BM to enhance the crystallinity of P3HT,thus improving the performance of polymer solar photovoltaic cell based on P3HT:PC71BM.With a large number of experiments,we obtained the best conditions of the optimal performance of our device,which were 55 minutes for the solvent annealing and nine minutes for the thermal annealing.Our polymer solar cells based on P3HT:PC71BM exhibited energy conversion efficiency(PCE)of 4.46%in AM 1.5G,100 mW/cm2 illumination conditions.2.For the PSC based on PCBM modified ZnO nanorod arrays,ZnO nanorod arrays were modified by organic PCBM to become rough,which can load more CH3NH3PbI3.In addition,PCBM energy level is located just between ZnO and CH3NH3PbI3 energy levels,which can facilitate the transmission of electrons and holes by reducing the energy loss during the transmission,and ultimately improving the photovoltaic performance of our PSC.Through the modification of PCBM,the Jscof our device increased from 18.95 mA·cm-2 to 22.06 mA-cm-2 with an increase of 21.7%.The Voc increased from a 0.78 V to 0.96 V with an increase of 21.8%,and PCE of the devices from the original 7.4%increase to 11.7%.In addition,our device also exhibits good stability that it has kept an efficiency of around 90%when being placed for 50 days.3.For the photodetector based on ZnO nanorods/CH3NH3PbI3/MoO3,We were first to introduce that ZnO nanorods and CH3NH3PbI3 were combined to be prepared a photodetector.In addition,we alsooptimized the thickness of the hole transport layer MoO3 to improve the detection performance of our detector.The detector is with unique structure so that its responsivity and detection sensitivity are up to 24.3 A/W and 3.56×1014cmHz1/2/W respectively.In addition,it is with relatively high response speed and it can be driven without external bias voltage to save energy.Moreover,the detector can simultaneously detect UV light and visible light to expand its range of application.What's more,with the isolation of MoO3,our detector's stability also improved. |
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