Time: April. 9th, 2018
Source: Institute of New Energy Technology in the College of Information Science and Technology
Publisher: JNU News Center

Prof. Tang Qunwei of the Institute of New Energy Technology in JNU's College of Information Science and Technology published a research paper titled High-Purity Inorganic Perovskite Films for Solar Cells with 9.72% Efficiency on March 26 in the AngewandteChemie International Edition, the top journal in the international chemical field.

All‐inorganic perovskite solar cells with high efficiency and improved stability are promising for commercialization. A multistep solution‐processing method was developed to fabricate high‐purity inorganic CsPbBr3 perovskite films for use in efficient solar cells. By tuning the number of deposition cycles (n) of a CsBr solution, the phase conversion from CsPb2Br5 (n ≤3), to CsPbBr3 (n=4), and Cs4PbBr6 (n≥5) was optimized to achieve vertical‐and monolayer‐aligned grains. Upon interfacial modification with graphene quantum dots, the all‐inorganic perovskite solar cell (without a hole‐transporting layer) achieved a power conversion efficiency (PCE) as high as 9.72 % under standard solar illumination conditions. Under challenging conditions, such as 90 % relative humidity (RH) at 25 °C or 80 °C at zero humidity, the optimized device retained 87 % PCE over 130 days or 95 % over 40 days, compared to the initial efficiency.

Tang is the project leader, and the first author is Duan Jialong, a doctoral candidate. This research is supported and funded by the National Natural Science Foundation of China (Program No.61774139, 21503202, 61604143).

Tang's research is devoted to new solar cell materials and devices over the long term. He has published 130 SCI research papers (including 102 papers in JCR Q1) in the international material sand chemical journals last five years as the first author or the project leader, demonstrating his international influence in the solar cell field.