Professor Xie Yongshu from East China University of science and technology made new progress in the research of porphyrin dye-sensitized solar cells

In order to deal with the energy crisis and the environmental pollution caused by fossil fuels, all kinds of solar cell research are widely concerned Among them, dye-sensitized solar cells have the advantages of simple preparation, low cost and high photoelectric conversion efficiency, and have made great progress in recent years Recently, Professor Xie Yongshu's team of feilinga Nobel joint research center of scientists of East China University of science and technology has made a breakthrough in the field of porphyrin dye-sensitized solar cells The relevant research results are entitled "efficient solar cells sensitized by a promising new type of porphyrins: Dye aggregation suppressed by double strapping" Published in Chemical Science (DOI: 10.1039 / c8sc04969f), a famous international chemical journal Porphyrin dye is an important sensitizer for solar cells In view of the serious aggregation of porphyrin macrocycles, the research team innovatively changed the traditional long carbon chain wrapped porphyrin into "bundle" type carbon chain wrapped porphyrin, and synthesized new porphyrin dyes xw40 and xw41, so as to more effectively inhibit dye aggregation and electronic recombination, extend electronic life and charge collection efficiency, and improve current and voltage Compared with the porphyrin dye xw10, xw41 not only inhibited dye aggregation, but also increased the adsorption capacity of the dye The open circuit voltage and short circuit current were increased from 711mv and 17.90ma · cm-2 to 730mv and 18.67ma · cm-2, respectively, which increased the photoelectric conversion efficiency from 8.6% to 9.3% In order to further broaden the absorption spectrum of the dye, the research team introduced the benzothiadiazole group (BTD), which has the ability of electron absorption, as an auxiliary receptor, to synthesize the dye xw41 The introduction of BTD can effectively enhance the absorption of dye in the near infrared region, and the red shift of absorption band edge of single color photoelectron conversion efficiency (IPCE) spectrum is up to 830 nm The team then used a combination of CO sensitization and CO adsorption strategy to improve the open circuit voltage and short circuit current at the same time Finally, the photoelectric conversion efficiency was increased to 10.6% (xw40) and 10.2% (xw41) The research results provide a new idea for the design and synthesis of efficient porphyrin dyes, and enrich and develop porphyrin synthesis chemistry The thesis was completed by Zeng Kaiwen, a doctoral student, under the guidance of Professor Xie Yongshu, and was carefully guided by academician Tian He The research was supported by major science and technology projects of Shanghai, international cooperation projects of science and technology of Shanghai, National Natural Science Foundation, distinguished professors (Oriental Scholars) of Shanghai universities, Shanghai Pujiang talent plan, special funds for basic scientific research business expenses of Central Universities and "111" talent introduction plan.