An Ultraviolet‐Deposited MoO<sub>3</sub> Film as Anode Interlayer for High‐Performance Polymer Solar Cells
Ping Cai, Peng Ren, Xiaofang Huang, Xiuyun Zhang, Tao Zhan, Jian Xiong, Xiaogang Xue, Zhongmin Wang, Jian Zhang, Junwu Chen
Abstract
Abstract An ultraviolet‐deposited MoO 3 film is developed as anode interlayer based on molybdenum(V) chloride as precursor. The ultraviolet‐deposited MoO 3 film is prepared from the precursor film (spin coated from its solution) with ultraviolet irradiation treatment, and the preparation process of the MoO 3 film is facile, low cost, and compatible with mass production and flexible substrate. The composition of the MoO 3 film is analyzed by X‐ray photoelectron spectroscopy. The work function as well as the surface morphology and wettability of indium tin oxide (ITO) modified by the MoO 3 film are investigated by ultraviolet photoelectron spectroscopy, atomic force microscopy, and contact angle tester, respectively, where the analyses show the ITO modified by the MoO 3 anode interlayer can offer excellent energy level alignment and interface contact with active layer. The photovoltaic performance of nonfullerene polymer solar cells (PSCs) based on the MoO 3 anode interlayer is researched with typical and relatively low‐cost PBDB‐T:ITIC as active layer, and the ITO/MoO 3 ‐based device shows the highest power conversion efficiency of 9.27% compared with the bare ITO‐based device (3.69%) and the ITO/PEDOT:PSS‐based device (9.15%). The results demonstrate the great potential of the ultraviolet‐deposited MoO 3 film as anode interlayer for high‐performance PSCs.