Show simple item record

dc.contributor.authorCao, Zhixiong
dc.contributor.authorChen, Jiale
dc.contributor.authorLiu, Shengjian
dc.contributor.authorQin, Minchao
dc.contributor.authorJia, Tao
dc.contributor.authorZhao, Jiaji
dc.contributor.authorLi, Qingduan
dc.contributor.authorYing, Lei
dc.contributor.authorCai, Yue-Peng
dc.contributor.authorLu, Xinhui
dc.contributor.authorHuang, Fei
dc.contributor.authorCao, Yong
dc.date.accessioned2020-02-05T10:18:34Z
dc.date.available2020-02-05T10:18:34Z
dc.date.issued2019-09-23
dc.date.submitted2019-09-01
dc.identifier.citationCao, Z., Chen, J., Liu, S., Qin, M., Jia, T., Zhao, J., … Cao, Y. (2019). Understanding of Imine Substitution in Wide-Bandgap Polymer Donor-Induced Efficiency Enhancement in All-Polymer Solar Cells. Chemistry of Materials, 31(20), 8533–8542. doi:10.1021/acs.chemmater.9b03570
dc.identifier.doi10.1021/acs.chemmater.9b03570
dc.identifier.urihttp://hdl.handle.net/10754/661381
dc.description.abstractAll-polymer solar cells (all-PSCs) are proven to possess outstanding thermal and mechanical stabilities. However, concurrently achieving appropriate phase-separated pattern, efficient charge transportation, and adequate charge transfer between donor and acceptor components is still a challenge, and thus, only a few polymer-polymer bulk heterojunction (BHJ) blends have yielded BHJ device power conversion efficiency (PCE) values of >8%. Generally, polymer backbone substitutions may have a direct influence on the device performance. Thus, this report examines a set of wide bandgap polymer donor analogues composed of thienothiophene (TT) or thiazolothiazole (TTz) motif, and their all-PSC device performance with N2200. Results show that all-PSCs based on the imine-substituted derivative PBDT-TTz exhibit PCE values as high as 8.4%, which largely outperform the analogue PBDT-TT-based ones with PCEs of only 0.7%. This work reveals that the imine substitution in polymer backbones of PBDT-TTz not only increases the ionization potential (IP) and electron affinity (EA), narrows the optical gap (Eopt), but also has significantly impacts on the BHJ film morphologies. PBDT-TTz:N2200 BHJ blends present better miscibility, suppressed phase separation, much stronger crystallinity, and face-on ordering, which contribute to efficient exciton dissociation, charge transportation, and therefore, high-efficiency in all-PSCs. This study demonstrates that the imine-substituted polymers composed of TTz motif, which can be easily synthesized through a facile two-step procedure, are a promising class of wide-bandgap polymer donors for efficient all-PSCs.
dc.description.sponsorshipThe authors thank Dawei Wang (Sun Yat-Sen University),Yuexing Zhang (Hubei University), Xin Song (King Abdullah University of Science & Technology (KAUST)), Lingling Shui (SCNU), Jinwei Gao (SCNU), and Wei Wei (SCNU) for help in XRD, DFT calculation, PESA, contact angle, thin film thickness, and PL measurements, respectively. The authors thank SCNU Analysis & Testing Center for technical support.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acs.chemmater.9b03570
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.chemmater.9b03570.
dc.titleUnderstanding of Imine Substitution in Wide-Bandgap Polymer Donor-Induced Efficiency Enhancement in All-Polymer Solar Cells
dc.typeArticle
dc.identifier.journalChemistry of Materials
dc.rights.embargodate2020-09-23
dc.eprint.versionPost-print
dc.contributor.institutionSchool of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangdong Provincial Engineering Technology Research Center for Materials for Energy Conversion and Storage, South China Normal University (SCNU), Guangzhou 510006, People’s Republic of China
dc.contributor.institutionDepartment of Physics, The Chinese University of Hong Kong (CUHK), New Territories, Hong Kong, People’s Republic of China
dc.contributor.institutionInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology (SCUT), Guangzhou 510640, People’s Republic of China
dc.date.accepted2019-09-22


This item appears in the following Collection(s)

Show simple item record