| 1. |
- Ji, Mengwei, et al.
(författare)
-
Recent Advances in Organic Photovoltaic Materials Based on Thiazole-Containing Heterocycles
- 2023
-
Ingår i: Macromolecular Rapid Communications. - 1022-1336 .- 1521-3927. ; 44:13
-
Forskningsöversikt (refereegranskat)abstract
- Organic solar cells (OSCs) have achieved great progress, driven by the rapid development of wide bandgap electron donors and narrow bandgap non-fullerene acceptors (NFAs). Among a large number of electron-accepting (A) building blocks, thiazole (Tz) and its derived fused heterocycles have been widely used to construct photovoltaic materials, especially conjugated polymers. Benefiting from the electron deficiency, rigidity, high planarity, and enhanced intra/intermolecular interactions of Tz-containing heterocycles, some related photovoltaic materials exhibit proper energy levels, optimized molecular aggregation, and active layer morphology, leading to excellent photovoltaic performance. This review focuses on the progress of Tz-based photovoltaic materials in the field of OSCs. First, the Tz-based donor and acceptor photovoltaic materials are reviewed. Then, the materials based on promising Tz-containing heterocycles, mainly including thiazolo[5,4-d]thiazole (TzTz), benzo[1,2-d:4,5-d’]bis(thiazole) (BBTz), and benzo[d]thiazole (BTz) are summarized and discussed. In addition, the new emerging Tz-fused structures and their application in OSCs are introduced. Finally, perspectives and outlooks for the further development of Tz-containing heterocycle-based photovoltaic materials are proposed.
|
|
| 2. |
- Tang, Ailing, et al.
(författare)
-
Simultaneously Achieved High Open-Circuit Voltage and Efficient Charge Generation by Fine-Tuning Charge-Transfer Driving Force in Nonfullerene Polymer Solar Cells
- 2018
-
Ingår i: Advanced Functional Materials. - : WILEY-V C H VERLAG GMBH. - 1616-301X .- 1616-3028. ; 28:6
-
Tidskriftsartikel (refereegranskat)abstract
- To maximize the short-circuit current density (J(SC)) and the open circuit voltage (V-OC) simultaneously is a highly important but challenging issue in organic solar cells (OSCs). In this study, a benzotriazole-based p-type polymer (J61) and three benzotriazole-based nonfullerene small molecule acceptors (BTA1-3) are chosen to investigate the energetic driving force for the efficient charge transfer. The lowest unoccupied molecular orbital (LUMO) energy levels of small molecule acceptors can be fine-tuned by modifying the end-capping units, leading to high V-OC (1.15-1.30 V) of OSCs. Particularly, the LUMO energy level of BTA3 satisfies the criteria for efficient charge generation, which results in a high V-OC of 1.15 V, nearly 65% external quantum efficiency, and a high power conversion efficiency (PCE) of 8.25%. This is one of the highest V-OC in the high-performance OSCs reported to date. The results imply that it is promising to achieve both high J(SC) and V-OC to realize high PCE with the carefully designed nonfullerene acceptors.
|
|
| 3. |
- Wang, Zongtao, et al.
(författare)
-
Shamrock-shaped non-fullerene acceptors enable high-efficiency and high-voltage organic photovoltaics
- 2024
-
Ingår i: Energy and Environmental Sciences. - 1754-5692 .- 1754-5706. ; 17:11, s. 3868-3877
-
Tidskriftsartikel (refereegranskat)abstract
- Minimizing energy loss to increase open-circuit voltage (VOC) is an essential topic to further improve the power conversion efficiency (PCE) in organic photovoltaics (OPVs). Though various molecular strategies have been developed, simultaneously achieving a VOC beyond 1.0 V and maintaining a high PCE above 15% is a huge challenge. Herein, with A-DA ' D-A type banana-shaped nonfullerene acceptor (NFA) Y6 as a benchmark, we creatively design acenaphtho[1,2-b]quinoxaline imide (AQI) as a large A ' unit and synthesize two shamrock-shaped NFAs AQI2 and AQI4, which contain different numbers of fluorine atoms on terminal groups. NFAs containing the AQI units could realize enhanced luminescence, decreased Stoke's shift, and minimized energy loss in OPVs. The conjugation extension in the longitudinal direction affords enlarged dipole moments, resulting in efficient hole transfer and long polaron lifetime. Consequently, the D18:AQI2-based devices obtained a PCE of 16.48% with an impressive VOC of 1.00 V, and the D18:AQI4-based devices achieved a higher PCE of 18.02% with a VOC of 0.95 V. A high PCE of 16.48% with a VOC of 1.0 V has been realized for the first time. Our work introduces an effective molecular design strategy and demonstrates that shamrock-shaped NFAs can be a class of promising materials for high-performance OPVs with high voltage. We developed two shamrock-shaped NFAs, AQI2 and AQI4. D18:AQI2 achieved a PCE of 16.48% with a VOC of 1.00 V, and D18:AQI4 achieved a higher PCE of 18.02% with a VOC of 0.95 V due to decreased energy loss and efficient photon utilization.
|
|
