Single Component Organic Solar Cells Based on Oligothiophene‐Fullerene Conjugate
Abstract
A new donor (D)–acceptor (A) conjugate, benzodithiophene‐rhodanine–[6,6]‐phenyl‐C61 butyric acid methyl ester (BDTRh–PCBM) comprising three covalently linked blocks, one of p‐type oligothiophene containing BDTRh moieties and two of n‐type PCBM, is designed and synthesized. A single component organic solar cell (SCOSC) fabricated from BDTRh–PCBM exhibits the power conversion efficiency (PCE) of 2.44% and maximum external quantum efficiency of 46%, which are the highest among the reported efficiencies so far. The SCOSC device shows efficient charge transfer (CT, ≈300 fs) and smaller CT energy loss, resulting in the higher open‐circuit voltage of 0.97 V, compared to the binary blend (BDTRh:PCBM). Because of the integration of the donor and acceptor in a single molecule, BDTRh‐PCBM has a specific D–A arrangement with less energetic disorder and reorganization energy than blend systems. In addition, the SCOSC device shows excellent device and morphological stabilities, showing no degradation of PCE at 80 °C for 100 h. The SCOSC approach may suggest a great way to suppress the large phase segregation of donor and acceptor domains with better morphological stability compared to the blend device.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 28, 2017
- Source ID
- 10.1002/adfm.201702474
Entities
People
- Bhoj Gautam
- Han Young Woo
- Jin Young Kim
- Kenan Gundogdu
- Song Yi Park
- Tack Ho Lee
- Thanh Luan Nguyen
Organizations
- Korea University
- National Research Foundation of Korea
- North Carolina State University
- Office of Naval Research
- Ulsan National Institute of Science and Technology