A depth behavioral understanding for each layer in perovskite solar cells(PSCs)and their interfacial interactions as a whole has been emerged for further enhancement in power conversion efficiency(PCE).Herein,NiO@Carbon was not only simulated as a hole transport layer but also as a counter electrode at the same time in the planar heterojunction based PSCs with the program wx AMPS(analysis of microelectronic and photonic structures)-1D.Simulation results revealed a high dependence of PCE on the effect of band offset between hole transport material(HTM)and perovskite layers.Meanwhile,the valence band offset(?E_v)of NiO-HTM was optimized to be -0.1 to -0.3 eV lower than that of the perovskite layer.Additionally,a barrier cliff was identified to significantly influence the hole extraction at the HTM/absorber interface.Conversely,the ?E_v between the active material and NiO@Carbon-HTM was derived to be -0.15 to 0.15 eV with an enhanced efficiency from 15% to 16%.
The interface between graphene and organic layers is a key factor responsible for the performance of graphene-based organic solar cells(OSCs). In this paper, we focus on coating PEDOT:PSS onto the surface of graphene. We demonstrate two approaches, applying UV/Ozone treatment on graphene and modifying PEDOT:PSS with Zonyl, to get a PEDOT:PSS well-coated graphene film. Our results prove that both methods can be effective to solve the interface issue between graphene and PEDOT: PSS. Thereby it shows a positive application of the composited graphene/PEDOT:PSS film on graphene-based OSCs.
