Boosting the power conversion efficiency of perovskite solar cells by adoptingintegrated-back-contacted structure

摘要

Perovskite solar cells (PSCs) have been attracting much attention due to its high performance and lowcost. Since the first report on PSCs in 2009, the power conversion efficiency (PCE) of the PSCs hasincreased rapidly, and reached 22.7% recently.[1] At the same time, the quantum efficiency of the PSCsbased on traditional sandwich structure has been approaching 100%. In order to further boost the PCE ofPSCs, we propose that adopting the integrated-back-contacted (IBC) structure may help to reduce light lossin PSCs. As shown in Fig. 1(a), in the sandwich-PSCs, the light can be reflected, scattered and absorbed bythe glass/ITO/CTL (charge transporting layer) layers before reaching perovskite materials. Whereas in theIBC-PSCs, the light is directly absorbed by the perovskite (Fig. 1(b)). Therefore, the light loss can belargely suppressed by adopting the IBC structure to PSCs.