Appropriate Molecular Interaction Enabling Perfect Balance Between Induced Crystallinity and Phase Separation for Efficient Photovoltaic BlendsShow others and affiliations
2020 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 12, no 23, p. 26286-26292Article in journal (Refereed) Published
Abstract [en]
Fluorination is a promising modification method to adjust the photophysical profiles of organic semiconductors. Notably, the fluorine modification on donor or acceptor materials could impact the molecular interaction, which is strongly related to the morphology of bulk heterojunction (BHJ) blends and the resultant device performance. Therefore, it is essential to investigate how the molecular interaction affects the morphology of BHJ films. In this study, a new fluorinated polymer PBDB-PSF is synthesized to investigate the molecular interaction in both nonfluorinated (ITIC) and fluorinated (IT-4F) systems. The results reveal that the F-F interaction in the PBDB-PSF:IT-4F system could effectively induce the crystallization of IT-4F while retaining the ideal phase separation scale, resulting in outstanding charge transport. On the contrary, poor morphology can be observed in the PBDB-PSF:ITIC system because of the unbalanced molecular interaction. As a consequence, the PBDB-PSF:IT-4F device delivers an excellent power conversion efficiency of 13.63%, which greatly exceeds that of the PBDB-PSF:ITIC device (9.84%). These results highlight manipulating the micromorphology with regard to molecular interaction.
Place, publisher, year, edition, pages
American Chemical Society , 2020. Vol. 12, no 23, p. 26286-26292
Keywords [en]
fluorination; induced crystalline; molecular interaction; phase separation; synergistic effect
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-174281DOI: 10.1021/acsami.0c06326ISI: 000541679900080PubMedID: 32397712OAI: oai:DiVA.org:liu-174281DiVA, id: diva2:1538152
2021-03-182021-03-182024-01-10Bibliographically approved