Colorful Semitransparent Organic Photovoltaics with Record Key Parameters by Optimizing Photon Utilization and Fabry-Prot Resonator Electrode

Donor PM6 and acceptor L8-BO are employed to build semitransparent organic photovoltaics (ST-OPVs). Opaque OPVs are fabricated by tuning the spin-coating speed of PM6:L8-BO solution to optimize the photon utilization by balancing photon harvesting and photogenerated carrier collection. The optimal opaque OPVs exhibit relatively high fill-factor (FF) of 77.58% and power conversion efficiency (PCE) of 15.07%, the average visible transmittance (AVT) of corresponding PM6:L8-BO films arrives to 53.25%, indicating great potential in realizing efficient ST-OPVs. ST-OPVs are built with 1 nm Au/(10, 15, 20, 25 nm) Ag as cathode, exhibiting the PCE/AVT of 11.53%/22.57%, 13.20%/14.24%, 14.28%/9.34%, and 14.71%/6.77%, respectively. Colorful ST-OPVs are achieved by coupling different Ag/LiF/Ag Fabry-Perot (F-P) resonator microcavity. Green ST-OPVs with varied color coordinates are achieved by fixing LiF layer thickness as 110 nm and varying Ag layers ' thickness, originating from the adjusted transmittance spectra of green ST-OPVs. Upon fixing Ag layers ' thickness as 15/25 nm and varying LiF layer thickness as 90, 110, and 145 nm, ST-OPVs present colors of blue, green, and red with corresponding transmittance peak at 474, 553, and 657 nm. The corresponding PCE/peak transmittance (Tpeak) values arrive to 13.80%/37.8%, 13.31%/28.4%, and 13.20%/27.7%, which should be the best performance among reported colorful ST-OPVs. Blue, green, and red ST-OPVs based on PM6:L8-BO active layer are achieved by employing different Ag/LiF/Ag Fabry-Perot resonator electrodes. The power conversion efficiency (PCE)/peak transmittance (Tpeak) values of the blue, green, and red ST-OPVs are individually 13.80%/37.8%, 13.31%/28.4%, and 13.20%/27.7% by optimizing photon utilization and Fabry-Perot resonator electrode, which are among the best performance of reported colorful ST-OPVs.image