Graphene oxide (GO) is employed as a hole conductor in inverted planar heterojunction perovskite solar cells, and the devices with CH₃NH₃PbI₃-xClx as absorber achieve an efficiency of over 12%. The perovskite film grown on GO exhibits enhanced crystallization, high surface coverage ratio as well as preferred in-plane orientation of the (110) plane. Efficient hole extraction from the perovskite to GO is demonstrated.

Room‐temperature solution‐processed ultrathin 2D MoS2 nanosheets are integrated into organic solar cells as an efficient hole extraction layer. An enhanced power conversion efficiency of 8.11% is achieved, which is superior to that of traditional vacuum‐evaporated molybdenum oxide.

The surface defects of solution-processed ZnO films lead to various intragap states. When the solution-processed ZnO films are used as electron transport interlayers (ETLs) in inverted organic solar cells, the intragap states act as interfacial recombination centers for photogenerated charges and thereby degrade the device performance. Here we demonstrate a simple surface-passivation method based on ethanedithiol (EDT) treatment, which effectively removes the surface defects of the ZnO nanocrystal films by forming zinc ethanedithiolates.

No abstract