Investigation Of Perovskite Solar Cells Based On P-type Semiconductor Nanomaterials Doped Hole Transport Layer

Among the study of perovskite solar cells?PSCs?,the research of hole transport layer?HTL?is very important.The most widely used hole transport material is spiro-OMeTAD.The extra dopants are used to dope into it because its intrinsic low conductivity and hole transport rate.In this work,we synthesized two types of p-type semiconductor nanomaterials.The details are as follows:?1?High quality colloidal Cu₉S₅ naocrystals?NCs?were prepared using a hot-injection approach.Multiple Cu₉S₅ NCs were further embedded in silica to construct a Cu₉S₅@SiO₂ supraparticle?SUP?.Cu₉S₅@SiO₂ SUPs were blended into Spiro-OMeTAD based HTLs with different weight ratios.Theoretical and experimental results show hat the very strong light scattering or reflecting properties of Cu₉S₅@SiO₂SUPs blended in the PSC device in a proper proportion distribute to increase the light energy trapped within the device,leading to significant enhancement of light absorption in the active layer.Additionally,the incorporated Cu₉S₅@SiO₂ supraparticles can also promote the electrical conductivity and hole-transport capacity of the HTL.As a result,efficient Cu₉S₅ SUPs based PSC devices were obtained with average power conversion efficiency?PCE?of 18.21%at an optimal weight ratio of Cu₉S₅SUPs.Compared with PSC solar cells without Cu₉S₅@SiO₂ supraparticles?of which the average PCE is 14.38%?,a remarkable enhancement over 26%in average PCE was achieved.?2?The CuGaO₂ nanoplates?CGO?was synthesized by hydrothermal method.Different weight ratios of CGO were incorporated into Spiro-OMeTAD based HTLs.The CGO can improve the electrical conductivity and hole extraction ability of HTL.Significantly larger conductivity and higher hole injection efficiency were demon-strated in the HTL with the optimal weight ratios of CGO.Hence,the PCE of PCSs based CGO raised from 15.78% to 18.32% compared with control device.The incorporation of CGO significantly improved the photovoltaic performance of PSCs.