| Organic solar cells（OSCs）are a promising green energy technology with many advantages,such as low production cost,high transparency,and light weight.And as one of the most representative applications in the field of OSCs,semitransparent organic solar cells（ST-OSCs）have huge potential in terms of building integrated photovoltaics（BIPVs）.However,the inherent contradiction between the power conversion efficiency（PCE）and the average visible light transmittance（AVT）hinders follow-up development of ST-OSCs.In order to solve this problem,we introduced a third material into the classic PM6:Y6 system to form hydrogen bond,and at the same time improved the photon trapping capability and film thickness tolerance of the devices,so as to obtain semitransparent ternary OSCs with high efficiency,high transmittance and high stability.The main contents of this paper are as follows:（1）TheorganicsmallmoleculematerialDIBC（3-（Diethylamino）-7-imino-7H-benzo[4,5]imidazo[1,2-a]chromeno[3,2-c]pyridine-6-car bonitrile）was introduced into PM6:Y6 system to realize high-efficiency opaque ternary OSCs,and the influence of the third material on the device performance was studied and analyzed.The experiment confirmed the existence of intermolecular hydrogen bond between DIBC and Y6,and this hydrogen bond enhanced the crystallinity of the acceptor,promoted the formation of a bi-continuous nano-scale interpenetrating network structure of the active layer film,and improved exciton dissociation and charge transport.Compared with the binary devices,the PCE of the ternary devices with a DIBC doping ratio of 10 wt%increased from 15.88%to 17.20%,the short-circuit current density(JSC)increased from 25.53 m A cm-2 to 27.02 m A cm-2,and the fill factor（FF）increased from 74.54%to 76.32%.The results show that the ternary optimization strategy based on intermolecular hydrogen bond interaction is very effective.（2）On the basis of the above system,we further studied the influence of hydrogen bond on film thickness tolerance,and fabricated high-performance semitransparent ternary OSCs using different types of semitransparent electrodes.When the active layer thickness was reduced from 150 nm to 70 nm,the PCE of all devices was higher than16%,which indicates that the system has good potential for preparing ST-OSCs.We replaced the 150 nm Ag electrode with thinner Ag（20 nm,25 nm,30 nm）electrodes,Au（20 nm,25 nm,30 nm）electrodes,and 10 nm Au/（10 nm,15 nm,20 nm）Ag electrodes,compared and analyzed the AVT and PCE of these ST-OSCs,finally found that the devices based on the Au/Ag combined electrodes performed best with 14%PCE and 21.60%AVT.（3）In addition,we conducted research and analysis on the stability of translucent devices.Compared with semitransparent binary devices,the thermal stability and light stability of semitransparent ternary devices were significantly enhanced by more than 20%,which indicates that the semitransparent ternary OSCs induced by hydrogen bonds can not only obtain better photovoltaic performance,but also gain higher stability.This has important realistic significance for the practical application of ST-OSCs.In this paper,high-performance semitransparent ternary OSCs were prepared by hydrogen bond induction,and the influence of the third material on device performance was further discussed,which provides ideas for the development of semitransparent devices in the future. |
