Since 2009, research based on methylamine ammonium lead iodine perovskite solar cells has drawn much attention, and now it has become a hot spot in international scientific research and industrial fields. In less than 8 years, its photoelectric conversion efficiency has been increasing from 2009 3% of the year all the way up to 22.1% in 2017. Methyl ammonium lead iodine perovskite material with direct band gap, adjustable absorption band gap and strong absorption, long carrier transport distance characteristics of photovoltaic devices is the most Ideal active absorption material.High quality perovskite film is the key to achieve high photoelectric conversion efficiency of perovskite solar cells.
Professor Wu Chao Xin telecom team focused on anti-type heterojunction perovskite solar cell perovskite research recently to find a group of simple methods to achieve high-quality perovskite film, have been photoelectric The conversion efficiency of up to 19.44% of the inverted planar heterojunction perovskite solar cells.In addition, the method is applied to a flexible battery, to achieve a high efficiency photoelectric conversion efficiency of 17.04% anti-plane heterojunction perovskite flexibility Batteries, located in the highest efficiency of the international thin-film solar cells.Potassium permanganate thin film prepared by spin-coating, the use of ammonium thiocyanate (NH4SCN) post-treatment, perovskite film after decomposition, and recrystallization process, formed More crystalline, more crystalline and less defective perovskite thin films.This research was published in an important international journal Advanced Functional Materials (Impact Factor 12.12) in November 2017. Title "Halogen-induced CH3NH3PbI3 Thin Film Recrystallization Engineering and Its Application in High Efficiency Inverted Planar Heterojunction Perovskite Solar Cells' (Hua Dong, Zhaoxin Wu *, et al, Advanced Functional Materials, D OI: 10.1002 / adfm. 201704836). The first author is Dr. Dong Hua, a young teacher of the research group (the first author unit and correspondent unit of the National Chiao Tung University), and the article is recommended as the current back cover article (The paper link is https://doi .org / 10.1002 / adfm.201704836).
In recent years, Professor Wu Chaoxin's team conducted in-depth research on flexible solar cells and flexible transparent conductive films and made a series of important achievements such as the world's first "vapor-spin-coating" perovskite thin film , A perovskite solar cell with high stability a-FAPbI3 was achieved in 2016 with a photoelectric conversion efficiency of 13.03% and an efficiency stability of more than one month (Zhaoxin Wu *, et al., Nano Energy, DOI : 10.1016 / j.nanoen. 2016.06.007) Based on this low-temperature thin film preparation technology, the difficulties in the film formation of tin-based perovskite have been overcome, and a highly efficient and flexible non-lead perovskite solar cell has been realized (Jun Xi, Zhaoxin Wu *, et al, Advanced Materials, 2017. 1606964) .Previously, silver nanowire transparent flexible conductive films have achieved significant results in ultrathin flexible films with a square resistance of less than 10 ohms and a permeability of more than 88% (Hua Dong, Zhaoxin Wu *, et al., ACS Appl. Mater. Interfaces 2016, 8, 31212-31221; Yaqiu Jiang, Jun Xi, Zhaoxin Wu * et al., Langmuir 2015, 31: 4950-4957). These important achievements are to further realize ultra- Lightweight and efficient Thin-film perovskite solar cells laid an important foundation.
Also involved in this work are Professor Alex K.-Y. Jen of the University of Washington and Professor Zhang Lijun of Jilin University. They have received the title of National Major Scientific Research Project (973) (No. 2013CB328705) and the Natural Science Foundation of China (No. 11574248) support.
