scholarly journals A helical perylene diimide-based acceptor for non-fullerene organic solar cells: synthesis, morphology and exciton dynamics

2018 ◽  
Vol 5 (5) ◽  
pp. 172041 ◽  
Author(s):  
Li Chen ◽  
Mingliang Wu ◽  
Guangwei Shao ◽  
Jiahua Hu ◽  
Guiying He ◽  
...  
Keyword(s):  
Solar Cells ◽  
Thermal Annealing ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Molecular Conformation ◽  
Transient Absorption ◽  
High Sensitivity ◽  
Perylene Diimide ◽  
Film Morphology ◽  
Femtosecond Transient Absorption

Helical perylene diimide-based (hPDI) acceptors have been established as one of the most promising candidates for non-fullerene organic solar cells (OSCs). In this work, we report a novel hPDI-based molecule, hPDI 2 -CN 2 , as an electron acceptor for OSCs. Combining the hPDI 2 -CN 2 with a low-bandgap polymeric donor (PTB7-Th), the blending film morphology exhibited high sensitivity to various treatments (such as thermal annealing and addition of solvent additives), as evidenced by atomic force microscope studies. The power conversion efficiency (PCE) was improved from 1.42% (as-cast device) to 2.76% after thermal annealing, and a PCE of 3.25% was achieved by further addition of 1,8-diiodooctane (DIO). Femtosecond transient absorption (TA) spectroscopy studies revealed that the improved thin-film morphology was highly beneficial for the charge carrier transport and collection. And a combination of fast exciton diffusion rate and the lowest recombination rate contributed to the best performance of the DIO-treated device. This result further suggests that the molecular conformation needs to be taken into account in the design of perylene diimide-based acceptors for OSCs.

scholarly journals Charge transport and extraction of PTB7:PC71BM organic solar cells: effect of film thickness and thermal-annealing

RSC Advances ◽  
2019 ◽  
Vol 9 (43) ◽  
pp. 24895-24903 ◽  
Author(s):  
Yingying Zhang ◽  
Xiong Li ◽  
Tingting Dai ◽  
Denghui Xu ◽  
Jianfeng Xi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Film Thickness ◽  
Charge Transport ◽  
Thermal Annealing ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Charge Carrier Transport ◽  
Charge Extraction

Charge carrier transport in the active layer and charge extraction at the electrode have significant impact on the performance of solar cells.

Morphology-performance relationships in polymer/fullerene blends probed by complementary characterisation techniques – effects of nanowire formation and subsequent thermal annealing

2015 ◽  
Vol 3 (35) ◽  
pp. 9224-9232 ◽  
Author(s):  
Jong Soo Kim ◽  
Sebastian Wood ◽  
Safa Shoaee ◽  
Steve J. Spencer ◽  
Fernando A. Castro ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Thermal Annealing ◽  
Organic Solar Cells ◽  
Film Morphology ◽  
Polymer Nanowires ◽  
Subsequent Thermal Annealing ◽  
Characterisation Techniques

Polymer nanowires are used to form organic solar cells, and the development of the thin film morphology during thermal annealing is characterised in detail.

scholarly journals Symmetry Induced Orderly Assembly Achieving High-Performance Perylene Diimide-based Non-Fullerene Organic Solar Cells

CCS Chemistry ◽  
2020 ◽  
pp. 1-18
Author(s):  
Shangshang Chen ◽  
Dong Meng ◽  
Jiachen Huang ◽  
Ningning Liang ◽  
Yan Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Perylene Diimide

Benzotriazacycle Cored Perylene Diimide Non-fullerene Acceptors for High-performance Organic Solar Cells

2021 ◽  
Vol 01 ◽  
Author(s):  
Min Deng ◽  
Zhenkai Ji ◽  
Xiaopeng Xu ◽  
Liyang Yu ◽  
Qiang Peng
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Energy Levels ◽  
Three Dimensional ◽  
Molecular Structures ◽  
Perylene Diimide ◽  
Photon Absorption ◽  
Optoelectronic Property ◽  
Design Synthesis

Background: Perylene diimide (PDI) is among the most investigated non-fullerene electron acceptor for organic solar cells (OSCs). Constructing PDI derivatives into three-dimensional propeller-like molecular structures is not only one of the viable routes to suppress the over aggregation tendency of the PDI chromophores, but also raises possibilities to tune and optimize the optoelectronic property of the molecules. Objective: In this work, we reported the design, synthesis, and characterization of three electron-accepting materials, namely BOZ-PDI, BTZ-PDI, and BIZ-PDI, each with three PDI arms linked to benzotrioxazole, benzotrithiazole, and benzotriimidazole based center cores, respectively. Method: The introduction of electron-withdrawing center cores with heteroatoms does not significantly complicate the synthesis of the acceptor molecules but drastically influences the energy levels of the propeller-like PDI derivatives. Result: The highest power conversion efficiency was obtained with benzoxazole-based BOZ-PDI reaching 7.70% for its higher photon absorption and charge transport ability. Conclusion: This work explores the utilization of electron-withdrawing cores with heteroatoms in the propeller-like PDI derivatives, which provides a handy tool to construct high-performance non-fullerene acceptor materials.

Rationalizing charge carrier transport in ternary organic solar cells

2022 ◽  
Vol 120 (2) ◽  
pp. 023302
Author(s):  
Haixia Hu ◽  
Xinyu Mu ◽  
Wei Qin ◽  
Kun Gao ◽  
Xiaotao Hao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Charge Carrier Transport
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