High‐Efficiency All‐Small‐Molecule Organic Solar Cells Based on an Organic Molecule Donor with Alkylsilyl‐Thienyl Conjugated Side Chains
Abstract
Two medium‐bandgap p‐type organic small molecules H21 and H22 with an alkylsily‐thienyl conjugated side chain on benzo[1,2‐b:4,5‐b′]dithiophene central units are synthesized and used as donors in all‐small‐molecule organic solar cells (SM‐OSCs) with a narrow‐bandgap n‐type small molecule 2,2′‐((2Z,2′Z)‐((4,4,9,9‐tetrahexyl‐4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl)bis(methanylylidene))bis(3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (IDIC) as the acceptor. In comparison to H21 with 3‐ethyl rhodanine as the terminal group, H22 with cyanoacetic acid esters as the terminal group shows blueshifted absorption, higher charge‐carrier mobility and better 3D charge pathway in blend films. The power conversion efficiency (PCE) of the SM‐OSCs based on H22:IDIC reaches 10.29% with a higher open‐circuit voltage of 0.942 V and a higher fill factor of 71.15%. The PCE of 10.29% is among the top efficiencies of nonfullerene SM‐OSCs reported in the literature to date.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 21, 2018
- Source ID
- 10.1002/adma.201706361
Entities
People
- Beibei Qiu
- Chenhui Zhu
- Chenkai Sun
- Chunhe Yang
- Haijun Bin
- Harald Ade
- Indunil Angunawela
- Jia Yao
- Liang Gao
- Lingwei Xue
- Long Ye
- Yankang Yang
- Yongfang Li
- Zhi‐guo Zhang
Organizations
- Beijing Jiaotong University
- Chinese Academy of Sciences
- Lawrence Berkeley National Laboratory
- Ministry of Science and Technology of the People's Republic of China
- National Natural Science Foundation of China
- North Carolina State University
- Office of Naval Research
- Royal Institute of Chemistry
- Soochow University
- United States Department of Energy
- University of Chinese Academy of Sciences