One-step facile synthesis of a simple carbazole-cored hole transport material for high-performance perovskite solar cells

• DOI: 10.1016/j.nanoen.2017.08.016
• Publication Date: 2017-08-14T12:02:47Z
• Authors: Xinxing Yin; Lei Guan; Jiangsheng Yu; Dewei Zhao; Changlei Wang; Niraj Shrestha; Yingbin Han; Qiaoshi An; Jie Zhou; Baojing Zhou; Yue Yu; Corey R. Grice; Rasha Abbas Awni; Fujun Zhang; Jianbo Wang; Randy J. Ellingson; Yanfa Yan; Weihua Tang
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract A carbazole-based hole-transporting material named 4,4′,4′′,4′′′-(9-octylcarbazole-1,3,6,8-tetrayl) tetrakis(N,N-bis(4-methoxyphenyl)aniline) (CZ-TA) has been developed through a one-step facile synthesis approach. The solution-processed planar perovskite solar cells (PVSCs) with 50 nm thick CZ-TA hole selective layer (HSL) contributes a power conversion efficiency of 18.32%, comparable to the most commonly used 200 nm spiro-OMeTAD (18.28%) HSLs. The improved hole extraction, transport and reduced recombination are found to endow CZ-TA-based devices with impressive fill factors over 81.0%. Importantly, the unit cost of HSL in PVSCs using CZ-TA can be as low as only 1/80 of that of spiro-OMeTAD, indicating that CZ-TA could be a promising candidate as HSLs for commercialization of the low-cost PVSC technology.