4.7 Article

Stable perovskite solar cells with efficiency of 22.6% via quinoxaline-based polymeric hole transport material

期刊

SCIENCE CHINA-CHEMISTRY
卷 64, 期 11, 页码 2035-2044

出版社

SCIENCE PRESS
DOI: 10.1007/s11426-021-1084-y

关键词

perovskite solar cells; hole transport materials; D-A copolymer; difluoroquinoxaline; stability

资金

  1. National Key Research and Development Program of China [2019YFA0705900]
  2. National Natural Science Foundation of China [51820105003, 21734008, 61904181]
  3. Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]

向作者/读者索取更多资源

The use of dopant-free D-A copolymer HTM can improve the performance of perovskite solar cells, increasing efficiency and enhancing stability.
Poor stability of spiro-OMeTAD hole transport materials (HTM) with dopant is a major obstacle for the commercialization of perovskite solar cell (pero-SC). Herein, we demonstrate a series of quinoxaline-based D-A copolymers PBQ5, PBQ6 and PBQ10 as the dopant-free polymer HTMs for high performance pero-SCs. The D-A copolymers are composed of fluorothienyl benzodithiophene (BDTT) as D-unit, difluoroquinoxaline (DFQ) with different side chains as A-unit, and thiophene as pi-bridge, where the side chains on the DFQ unit are bi-alkyl for PBQ5, bi-alkyl-fluorothienyl for PBQ6, and alkoxyl for PBQ10. All the three copolymers are adopted as the dopant-free HTM in the pero-SCs. The planar n-i-p structured pero-SCs based on (FAP-bI(3))(0.98)(MAPbBr(3))(0.02) with PBQ6 HTM demonstrated the high power conversion efficiency (PCE) of 22.6% with V-oc of 1.13 V and FF of 80.8%, which is benefitted from the suitable energy level and high hole mobility of PBQ6. The PCE of 22.6% is the highest efficiency reported in the n-i-p structured pero-SCs based on dopant-free D-A copolymer HTM. In addition, the pero-SCs show significantly enhanced ambient, thermal and light-soaking stability compared with the devices with traditional spiro-OMeTAD HTM.

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