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dc.contributor.authorHu, Hanlin
dc.contributor.authorDeng, Wanyuan
dc.contributor.authorQin, Minchao
dc.contributor.authorYin, Hang
dc.contributor.authorLau, Tsz-Ki
dc.contributor.authorFong, Patrick W.K.
dc.contributor.authorRen, Zhiwei
dc.contributor.authorLiang, Qiong
dc.contributor.authorCui, Li
dc.contributor.authorWu, Hongbin
dc.contributor.authorLu, Xinhui
dc.contributor.authorZhang, Weimin
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorLi, Gang
dc.date.accessioned2019-05-21T13:14:13Z
dc.date.available2019-05-21T13:14:13Z
dc.date.issued2019-04-17
dc.identifier.citationHu H, Deng W, Qin M, Yin H, Lau T-K, et al. (2019) Charge carrier transport and nanomorphology control for efficient non-fullerene organic solar cells. Materials Today Energy 12: 398–407. Available: http://dx.doi.org/10.1016/j.mtener.2019.04.005.
dc.identifier.issn2468-6069
dc.identifier.doi10.1016/j.mtener.2019.04.005
dc.identifier.urihttp://hdl.handle.net/10754/653048
dc.description.abstractSingle junction organic photovoltaic devices (OPVs) have exceeded 15% power conversion efficiency (PCE) with the help of fused ring based low-bandgap non-fullerene acceptors (NFAs). As a major type of NFA, the indacenodithiophene derivative NFA (IDTBR) has been shown to have superior OPV stability with outstanding VOC, but the efficiency is relatively lower compared to the reported OPV champion devices. Further improvements towards high efficiencies in this OPV system remains challenging due to the relatively poor charge carrier transport properties in the bulk heterojunction film, particularly the electron transport in small molecule non-fullerene acceptor network. Here we conducted detailed study on the dependence of carrier transport on BHJ donor–acceptor (D–A) composition. Our results show that the nano-morphology or phase aggregation of non-fullerene acceptor (NFA) molecules can be tuned via D–A composition in bulk heterojunction layer, and the improvement of electron mobility was shown to be enhanced by almost one order – from 1.23 × 10−6 cm2/V (D:A = 1:1 by weight) to 1.02 × 10−5 cm2/V (D:A = 1:2) – due to the improved connectivity of electron transport pathways. Further increase of NFA component content, however, has led to over-sized phase segregation, deteriorating the photovoltaic performance of organic soar cells. The optimized BHJ cell shows more balanced charge carrier transport and phase segregation, which yields a PCE of 10.79%. Furthermore, it shows a VOC as high as 1.03 V, which is ascribed to the significantly suppressed radiative and non-radiative recombination losses with bandgap-VOC offset Eg/q-VOC of only 0.55 V.
dc.description.sponsorshipThis work was supported by Shenzhen Science and Technology Innovation Commission (Project No. JCYJ20170413154602102), Research Grants Council of Hong Kong (Grant No. 15246816, and 15218517), the Project of Strategic Importance provided by the Hong Kong Polytechnic University (Project No. 1-ZE29). W.Z acknowledges financial support from National Natural Science Foundation of China (21464003). X.L thanks Research Grant Council of Hong Kong (General Research Fund No. 14314216). H.W is grateful of National Natural Science Foundation of China (No. 51521002 and 61775061) for the financial support.
dc.publisherElsevier BV
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S2468606918303708
dc.subjectCharge carrier transport
dc.subjectD:A ratio
dc.subjectEnergy loss
dc.subjectNon-fullerene acceptors
dc.subjectOrganic solar cells
dc.subjectPhase segregation
dc.titleCharge carrier transport and nanomorphology control for efficient non-fullerene organic solar cells
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalMaterials Today Energy
dc.contributor.institutionDepartment of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Hum, , Hong Kong
dc.contributor.institutionThe Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, , China
dc.contributor.institutionInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, , China
dc.contributor.institutionDepartment of Physics, The Chinese University of Hong Kong, New Territories, 999077, , Hong Kong
dc.contributor.institutionCollege of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006, , China
kaust.personZhang, Weimin
kaust.personMcCulloch, Iain
dc.date.published-online2019-04-17
dc.date.published-print2019-06


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