Electron-Deficient and Quinoid Central Unit Engineering for Unfused Ring-Based A(1)-D-A(2)-D-A(1)-Type Acceptor Enables High Performance Nonfullerene Polymer Solar Cells with High V-oc and PCE Simultaneously

Zhang, Chao1; Song, Xin2,3; Liu, Kai-Kai1; Zhang, Ming4,5; Qu, Jianfei6; Yang, Can1; Yuan, Gui-Zhou1; Mahmood, Asif1; Liu, Feng4,5; He, Feng6; Baran, Derya2; Wang, Jin-Liang1

2020-05-06

10.1002/smll.201907681

Small   影响因子和分区

1613-6810

1613-6829

Here, a pair of A(1)-D-A(2)-D-A(1) unfused ring core-based nonfullerene small molecule acceptors (NF-SMAs), BO2FIDT-4Cl and BT2FIDT-4Cl is synthesized, which possess the same terminals (A(1)) and indacenodithiophene unit (D), coupling with different fluorinated electron-deficient central unit (difluorobenzoxadiazole or difluorobenzothiadiazole) (A(2)). BT2FIDT-4Cl exhibits a slightly smaller optical bandgap of 1.56 eV, upshifted highest occupied molecular orbital energy levels, much higher electron mobility, and slightly enhanced molecular packing order in neat thin films than that of BO2FIDT-4Cl. The polymer solar cells (PSCs) based on BT2FIDT-4Cl:PM7 yield the best power conversion efficiency (PCE) of 12.5% with a V-oc of 0.97 V, which is higher than that of BO2FIDT-4Cl-based devices (PCE of 10.4%). The results demonstrate that the subtle modification of A(2) unit would result in lower trap-assisted recombination, more favorable morphology features, and more balanced electron and hole mobility in the PM7:BT2FIDT-4Cl blend films. It is worth mentioning that the PCE of 12.5% is the highest value in nonfused ring NF-SMA-based binary PSCs with high V-oc over 0.90 V. These results suggest that appropriate modulation of the quinoid electron-deficient central unit is an effective approach to construct highly efficient unfused ring NF-SMAs to boost PCE and V-oc simultaneously.

central electron-deficient segment difluorobenzothiadiazole nonfullerene organic solar cells polymer solar cells unfused ring small molecular acceptors

SCI ; EI

英语

其他

National Natural Science Foundation of China[21672023][21971014][21472012] ; National Key Research and Development Program of China[2018YFA0901800]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000530617300001

WILEY-V C H VERLAG GMBH

20202108692232

Chlorine compounds ; Cell engineering ; Hole mobility ; Electrons ; Electron energy levels ; Molecular orbitals ; Synthesis (chemical) ; Morphology

Biomedical Engineering:461.1 ; Solar Cells:702.3 ; Semiconducting Materials:712.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

Web of Science

1.Beijing Inst Technol, Sch Chem & Chem Engn, Beijing Key Lab Photoelect Electrophoton Convers, Key Lab Cluster Sci,Minist Educ, 5 South Zhongguancun St, Beijing 100081, Peoples R China
2.King Abdullah Univ Sci & Technol KAUST, Phys Sci & Engn Div PSE, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
3.Jiangnan Univ, Sch Mech Engn, Ctr Micronano Engn, Wuxi 214122, Jiangsu, Peoples R China
4.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China
5.Shanghai Jiao Tong Univ, Collaborat Innovat Ctr IFSA CICIFSA, Shanghai 200240, Peoples R China
6.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China

Zhang, Chao,Song, Xin,Liu, Kai-Kai,et al. Electron-Deficient and Quinoid Central Unit Engineering for Unfused Ring-Based A(1)-D-A(2)-D-A(1)-Type Acceptor Enables High Performance Nonfullerene Polymer Solar Cells with High V-oc and PCE Simultaneously[J]. Small,2020,16(22).

Zhang, Chao.,Song, Xin.,Liu, Kai-Kai.,Zhang, Ming.,Qu, Jianfei.,...&Wang, Jin-Liang.(2020).Electron-Deficient and Quinoid Central Unit Engineering for Unfused Ring-Based A(1)-D-A(2)-D-A(1)-Type Acceptor Enables High Performance Nonfullerene Polymer Solar Cells with High V-oc and PCE Simultaneously.Small,16(22).

Zhang, Chao,et al."Electron-Deficient and Quinoid Central Unit Engineering for Unfused Ring-Based A(1)-D-A(2)-D-A(1)-Type Acceptor Enables High Performance Nonfullerene Polymer Solar Cells with High V-oc and PCE Simultaneously".Small 16.22(2020).