Journal
ENERGY TECHNOLOGY
Volume 10, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202200199
Keywords
cathode interfacial layers; interfacial dipoles; n-type backbones; polymer solar cells
Categories
Funding
- National Natural Science Foundation of China [61964010, 62064006]
- Natural Science Foundation of Gansu Province [21JR7RA285]
- Innovation Star project for utstanding graduate students in Gansu Province [2021CXZX-593]
- Industrial Support Plan Project of Colleges And Universities In Gansu Province [2021CYZC19]
- West Light Foundation of The Chinese Academy of Sciences
- Tianyou Youth Talent Lift Program of Lanzhou Jiaotong University
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A new alcohol-soluble polymer PFN-ID is synthesized and applied to polymer solar cells. The introduction of PFN-ID improves electron transfer performance and device performance, increasing the power conversion efficiency by 1.62 times.
A new alcohol-soluble polymer PFN-ID is successfully synthesized by combining N,N-di(2-ethylhexyl)-6,6 '-dibromoisoindigo and an amino-containing fluorene subunits, and applied to polymer solar cells (PSCs) with PTB7-Th:PC71BM as an active layer. The n-type backbone of the PFN-ID improves electron transfer performance and thus optimizes device performance. The PSCs with PFN-ID as cathode interfacial layers (CILs) have significantly improved compared to the device without the interface layer, especially the optimum power conversion efficiency (PCE) of PSCs reaches up to 9.24%, which is 1.62 times higher than that of devices without CILs. The I-V curves show that the introduction of the n-type backbone leads to a significant increase in the conductivity of PFN-ID compared to PFN. The UV photoelectron spectroscopy and Mott-Schottky curves further confirm that PFN-ID can decrease the work function of Al electrode, and increase its built-in potential, giving higher open-circuit voltage. The resulting conventional PSCs using PFN-ID as cathode interlayer achieve high photovoltaic performance, and the research results can provide a new strategy for the advancement of PSCs.
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