基于氧化石墨烯空穴传输层的钙钛矿太阳能电池

Perovskite Solar Cells Based on Graphene Oxide Hole Transport Layer

采用溶液旋涂法在平面异质结型钙钛矿电池中引入氧化石墨烯(Graphene oxide,GO),制备了GO、GO∶(PEDOT:PSS)复合薄膜和GO/PEDOT∶PSS双层薄膜作为空穴传输层的电池,其光电转换效率分别为1.86%、7.35%、7.69%,基于PEDOT∶PSS空穴传输层的对照电池的效率为7.38%.主要原因是GO具有绝缘性,作为阳极界面层时,随着GO薄膜厚度增加,器件的串联电阻增大,从而降低了电池的短路电流和效率.为提高GO导电性,并改善其功函数,将GO氨化改性后与PEDOT:PSS组合构成双空穴传输层,所得电池取得了7.69%的较高效率,表明该方式是GO用于钙钛矿电池空穴传输层的有效途径.

Graphene Oxide (GO) was introduced as a hole transport layer material in a planar heterojunction perovskite battery by solution spin coating. The photoelectric conversion efficiencies of the prepared cells based on GO, GO∶(PEDOT:PSS) composite film and GO/PEDOT∶PSS double-layer film as hole transport layer are 1.86%, 7.35%, and 7.69%, respectively. And the efficiency of the control cell based on PEDOT∶PSS as the transport layer is 7.38%. The main reason is that graphene oxide has insulation properties. When graphene oxide as the anode interface layer, the series resistance of the device increases with the thickness of the graphene oxide film increases, thereby reducing the short-circuit current and efficiency of the battery. In order to improve the conductivity of graphene oxide and its work function, the oxidation of graphene oxide was combined with PEDOT:PSS to form a two-hole transport layer. The battery achieves a high efficiency of 7.69%, which proves that this is oxidation is an effective way for graphene to be used in the hole transport layer of perovskite cells.