We developed a self-powered broadband perovskite/silicon hybrid photodetector based on a novel heterostructure of Si/SnO2/MAPbI3/MoO3. The insertion of SnO2 and MoO3 was effective in reducing the recombination of photogenerated carriers. By optimizing the thickness of the SnO2 layer, the detection capabilities of the hybrid photodetectors were significantly improved. The best-performing photodetector had a 40 nm SnO2 layer, showing a detectivity of 2.23 × 1012 Jones with a responsivity of 50.9 mA W−1 at 815 nm and a photocurrent/dark current ratio of 3.37 × 104 under zero bias. Furthermore, the photodetectors were sensitive to broadband irradiation from 300 to 1150 nm.
A hybrid energy harvesting system that simultaneously generates electrical energy and chemical energy with an increased overall energy conversion efficiency is designed. A photovoltaic system together with photosynthesis-executing plants forms the system. The photosynthesis-executing plants are placed directly behind or under the solar cells, but the presence of the solar cells does not affect the photosynthesis process of the plant. The spectral characteristics of the solar cells are tuned to allow for optimal plant growth. To achieve the required spectral absorption, the solar cells are tailored by using a high-band-gap (1.95 eV) mixed-halide perovskite. A guide on how to achieve an efficient hybrid energy-harvesting system is introduced. Furthermore, the suggested solar module enables a simple manufacturing process, which is consistent with the fabrication of most thin-film solar modules.
Nanopatterned poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layers fabricated by soft-nanoimprint were applied to CH3NH3PbBr3 (MAPbBr3) light-emitting diodes to enhance light extraction. The electric field distribution of MAPbBr3 devices with different periods of the nanopatterned PEDOT:PSS was calculated using the finite-difference time-domain method, demonstrating that the 400-nm period was more effective in improving light outcoupling. By integrating the nanopatterned PEDOT:PSS layer, the external quantum efficiency of the device increased from 6.5% to 10.3%. It can be attributed to the fact that the nanopatterned structure reduced the refractive index discontinuity at the interface between MAPbBr3 and PEDOT:PSS, thereby reducing light trapping in the waveguide mode.
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