Study On Efficient All-Inorganic Perovskite/Organic Tandem Semitransparent Solar Cells

As they offer a wide range of potential applications in the field of photovoltaic building integration,Semitransparent solar cells(ST-SCs)have attracted great attention.Nevertheless,two key scientific issues must be resolved urgently for in-depth industrial application of ST-SCs.The first is the ideal trade-off between photoelectric conversion efficiency(PCE)and average visible transmittance(AVT),and the compatibility of STSCs’ color display with human visual perception is the second issue.For their commercial uses,it is crucial to produce efficient ST-SCs with suitable light transmittance and color that are agreeable to human eye while keeping acceptable PCE.Based on this,from the perspective of obtaining outstanding photovoltaic and optical properties and great color-fidelity,this work systematically investigates and analyzes the ST-SC’s performance and the matching of human visual perception,focusing on the following main points:1.It is challenging to obtain good eye comfort ST-OSCs with suitable AVT,PCE,and CRI because the three factors affect and restrict mutually.To realize highperformance ST-OSCs,theoretical transmittance spectra of ST-OSCs are obtained using the finite-difference time-domain(FDTD)simulation,and then the theoretical optimized structural parameters with appropriate AVT and CRI are achieved.Under the guidance of theoretical simulation,non-fuller PM6:Y6-based ST-OSCs with Ga2O3 or In2O3 electron collection layers were fabricated,and all of the devices demonstrate good photovoltaic and color performance.The PCE for devices with In2O3 gets up to 13.0%with an AVT of 21.5%and a CRI of 88.3,and the PCE for devices with Ga2O3 reaches up to 13.0%with an AVT of 22.5%and a CRI of 86.9.It is obvious that both blue devices make sure that the visual reaction is comfortable when the user passes past the device.Further analysis revealed that efficient charge extraction/transfer and decreased interfacial recombination losses from PM6:Y6 based devices were the main factors enhancing ST-OSCs photovoltaic performance.This work offers a simple method for obtaining power glass with pleasing eye-comfort hues.2.ST-SCs need to balance optical and photovoltaic performance fairly,and they must also take into account the device’s color-fidelity to match human vision.Yet,given how difficult it is to create ST-SCs with excellent color-fidelity,few studies have focused on improving color-fidelity.The color-fidelity of perovskite and organic photoactive layers is carefully assessed in this research,and for the first time,we comprehensively evaluate CsPbI2Br/PTB7-Th:IEICO-4F-based semitransparent perovskite/organic tandem solar cells(P/O-TSCs)with outstanding neutral-color perception.First,we establish a numerical method to evaluate the color-fidelity of P/OTSCs via proposing the transmittance fluctuation factor(TFFVIS)in the visible region and the fluctuation factor of infrared external quantum efficiency.The optimum structure of semitransparent tandem device is created using the best possible design for the optical absorption selectivity(S)of P/O-TSCs.Moreover,PTB7-Th was used to passivate the halogen vacancy defects on CsPbI2Br surface,decrease energy barrier and enhance interfacial hole extraction and transport,resulting in single-junction allinorganic perovskite devices with 14.19%PCE and 80.06%high fill factor(FF).As a result,neutral-colored semitransparent P/O-TSCs with a TFFVIS of 2.99,S of 0.078 and color coordinate of(0.344,0.349)are achieved,which display natural color and can excellently retain the subjects’ original color.As expected,neutral-colored semitransparent P/O-TSCs possess a highly PCE of 13.56%,an AVT of 26.28%and a CRI of 96.4.The synergistic effect of TFFvis and light-absorbing selectivity can pave the way for semitransparent P/O-TSCs as promising power-generating windows with high photovoltaic efficiency and good color-fidelity.