Recently, Furui Tan’s research group of the Photovoltaic Laboratory has made important progress in the development of a new type of hole transport layer for perovskite solar cells. The research results are titled "Perovskite Solar Cells with Polyaniline Hole Transport Layers Surpassing a 20% Power Conversion Efficiency" and published in The top international journal Chemistry of Materials (impact factor 9.567). Paper link:
https://pubs.acs.org/doi/10.1021/acs.chemmater.1c01176
Research on new perovskite solar cells for commercial applications has attracted much attention in recent years. Compared with the traditional cis-perovskite cell structure, the trans-structure has more prominent advantages in realizing device flexibility, integration, and gentle process. The organic semiconductor hole transport layer (window layer) (HTL) is the key to achieving the above advantages. At present, the commonly used HTL materials in high-efficiency devices are mostly materials such as PEDOT: PSS, PTAA or PTPD, which have a single function, are difficult to surface modification and are expensive. In order to develop new high-efficiency organic HTL materials that do not require secondary treatment, have surface functionalization and are low-cost, we use electrochemical polymerization methods to directly grow common polyaniline films on the surface of conductive electrodes. Through key innovations in dopant replacement technology, we obtain The smooth and dense organic polyaniline film with surface chlorine atom function overcomes the shortcomings of low solubility of traditional polyaniline powder and difficulty in film formation. The functionalized polyaniline film obtained by the electrochemical method can not only effectively extract holes, but also passivate the surface defects of the perovskite in contact with it, and optimize the contact through the interface can also improve the crystalline quality of the perovskite body film , A new low-cost HTL layer that realizes multi-functional integration and improves the performance of hybrid perovskite photovoltaic devices with polyaniline as HTL to more than 20% (20.7%) for the first time.
This research was supported by the Outstanding Youth Fund of the Natural Science Foundation of Henan Province and the Innovative Talents Introducing Base Project of Henan University. Master student Mei Yantao of the Photovoltaic Laboratory and young teacher Dr. Zhitao Shen are the co-first authors, and associate professor Tan Furui is the first newsletter The author, Professor Zhang Weifeng and Professor Makhsud I. Saidaminov from the University of Victoria in Canada are the co-corresponding authors.
