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Simultaneously Achieved High Open-Circuit Voltage and Efficient Charge Generation by Fine-Tuning Charge-Transfer Driving Force in Nonfullerene Polymer Solar Cells
Natl Ctr Nanosci and Technol, Peoples R China.
Natl Ctr Nanosci and Technol, Peoples R China.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-2582-1740
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2018 (engelsk)Inngår i: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 28, nr 6, artikkel-id 1704507Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

To maximize the short-circuit current density (J(SC)) and the open circuit voltage (V-OC) simultaneously is a highly important but challenging issue in organic solar cells (OSCs). In this study, a benzotriazole-based p-type polymer (J61) and three benzotriazole-based nonfullerene small molecule acceptors (BTA1-3) are chosen to investigate the energetic driving force for the efficient charge transfer. The lowest unoccupied molecular orbital (LUMO) energy levels of small molecule acceptors can be fine-tuned by modifying the end-capping units, leading to high V-OC (1.15-1.30 V) of OSCs. Particularly, the LUMO energy level of BTA3 satisfies the criteria for efficient charge generation, which results in a high V-OC of 1.15 V, nearly 65% external quantum efficiency, and a high power conversion efficiency (PCE) of 8.25%. This is one of the highest V-OC in the high-performance OSCs reported to date. The results imply that it is promising to achieve both high J(SC) and V-OC to realize high PCE with the carefully designed nonfullerene acceptors.

sted, utgiver, år, opplag, sider
WILEY-V C H VERLAG GMBH , 2018. Vol. 28, nr 6, artikkel-id 1704507
Emneord [en]
benzotriazole; charge generation; driving force; nonfullerene acceptor; voltage loss
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-145236DOI: 10.1002/adfm.201704507ISI: 000424152900004OAI: oai:DiVA.org:liu-145236DiVA, id: diva2:1188349
Merknad

Funding Agencies|National Key Research and Development Program of China [2017YFA0206600]; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SLH033]; National Natural Science Foundation of China [51673048, 51473040, 21602040]; National Natural Science Foundation of Beijing [2162045]

Tilgjengelig fra: 2018-03-07 Laget: 2018-03-07 Sist oppdatert: 2018-04-13

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