A solution-processed hole-transporting layer for planar perovskite solar cells (PSCs) is developed by simply incorporating the CrO₃ aqueous solution into the ploy(3,4-ethylene-dioxythiophene):ploystyrenesulfonate (PEDOT:PSS) aqueous dispersion. Besides the merits of high conductivity and interface modification, PEDOT:PSS-CrO₃ composite films can act as a good underlayer for the growth of the crystal perovskite films. The CH₃NH₃PbI_3−xCl_x film deposited on the PEDOT:PSS-CrO₃ underlayer demonstrates high quality with large-scale domains and good film uniformity, which results in obvious improvement of the absorption in almost whole visible-light range. The resulting PSC device shows a power conversion efficiency (PCE) as high as 16.90%.

通过将CrO ₃水溶液简单地掺入多（3,4-乙烯-二氧噻吩）：苯乙烯磺酸盐（PEDOT：PSS）水分散体中，即可开发出用于平面钙钛矿太阳能电池（PSC）的溶液处理空穴传输层。除了具有高电导率和界面改性的优点外，PEDOT：PSS-CrO ₃复合膜还可以作为钙钛矿晶体生长的良好底层。在PEDOT：PSS-CrO ₃上沉积的CH ₃ NH ₃ PbI _3-x Cl _x膜底层具有高质量，大范围的区域和良好的薄膜均匀性，从而在几乎整个可见光范围内都显着改善了吸收率。所得的PSC器件显示出高达16.90％的功率转换效率（PCE）。