关键词: 平面异质结, 钙钛矿太阳电池, 空穴传输层, 氧化钨, 稳定性

Abstract:

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a commonly used hole-transport material in the perovskite solar cells (PerSCs) structure of perovskite/fullerene planer heterojunction, but it also has a negative effect on the stability of device because of its acidity which will corrode metal oxide transparent electrodes. In this work, a WO_x hole-transport layer with high work function was inserted into the PEDOT: PSS and FTO to enhance the stability and photovoltaic performance. The inserted WO_x layer not only can avoid direct contact between PEDOT:PSS and FTO, but also can further reduce the contact barrier between the electrode interface. We studied the effect of WO_x/PEDOT:PSS double-layered hole transport layers on the optical transmittance, the morphology and crystals of perovskite, the photovoltaic performance and the stability of the devices. The power conversion efficiency (PCE) of PerSCs can be improved from 10.56% (with PEDOT:PSS layer) to 12.96% with WO_x/PEDOT:PSS double-layered hole transport layers, and the stability of the device has also been greatly improved.