Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 8, Pages 1161-1168Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201504153
Keywords
nonfullerene acceptor; organic electronics; organic semiconducting materials; solar cells; structure-property relationships
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Funding
- PRESTO program from Japan Science and Technology Agency (JST)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Collaborative Research Program of ICR, Kyoto University [2015-12]
- Grants-in-Aid for Scientific Research [16H04191, 25110004] Funding Source: KAKEN
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The development of nonfullerene acceptor materials applicable to organic photovoltaics (OPVs) has attracted considerable attention for the achievement of a high power conversion efficiency (PCE) in recent years. However, it is still challenging due to the insufficiency of both the variety of effective electron-deficient units and certain guidelines for the design of such materials. This work focusses on naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole (NTz) as a key electron-deficient unit. Therefore, a new electron-accepting -conjugated compound (NTz-Np), whose structure is based on the combination of NTz and the fluorene-containing imide-annelated terminal units (Np), is designed and synthesized. The NTz-Np compound exhibits a narrow optical energy gap (1.73 eV), a proper energy level (-3.60 eV) of the lowest unoccupied molecular orbital, and moderate electron mobility (1.6 x 10(-5) cm(2) V-1 s(-1)), indicating that NTz-Np has appropriate characteristics as an acceptor against poly(3-hexylthiophene) (P3HT), a representative donor. OPV devices based on NTz-Np under the blend with P3HT show high photovoltaic performance with a PCE of 2.81%, which is the highest class among the P3HT/nonfullerene-based OPVs with the conventional device structure. This result indicates that NTz unit can be categorized as a potential electron-deficient unit for the nonfullerene acceptors.
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