Planar conjugated polymers containing 9,10-disubstituted phenanthrene units for efficient polymer solar cells.
Four novel conjugated polymers (P1-4) with 9,10-disubstituted phenanthrene (PhA) as the donor unit and 5,6-bis(octyloxy)benzothiadiazole as the acceptor unit are synthesized and characterized. These polymers are of medium bandgaps (2.0 eV), low-lying HOMO energy levels (below -5.3 eV), and high hole mobilities (in the range of 3.6 × 10(-3) to 0.02 cm(2) V(-1) s(-1) ). Bulk heterojunction (BHJ) polymer solar cells (PSCs) with P1-4:PC71 BM blends as the active layer and an alcohol-soluble fullerene derivative (FN-C60) as the interfacial layer between the active layer and cathode give the best power conversion efficiency (PCE) of 4.24%, indicating that 9,10-disubstituted PhA are potential donor materials for high-efficiency BHJ PSCs.
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875, China.
Guangwu
G
Li
Chong
C
Kang
Cuihong
C
Li
Zhen
Z
Lu
Jicheng
J
Zhang
Xue
X
Gong
Guangyao
G
Zhao
Huanli
H
Dong
Wenping
W
Hu
Zhishan
Z
Bo
D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004735:Energy Transfer; D015394:Molecular Structure; D055620:Optical Phenomena; D010316:Particle Size; D010616:Phenanthrenes / Q000737:chemistry*; D055668:Photochemical Processes; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D012993:Solar Energy; D013499:Surface Properties
D010616:Phenanthrenes; D011108:Polymers; C031181:phenanthrene
conjugated polymers; donor materials; phenanthrene; polymer solar cells