scholarly journals Two Novel, Simple-Structured and Easy-Synthesized Acceptors Based on Fluorene or Carbazole for Non-Fullerene Organic Solar Cells

2021 ◽  
Author(s):  
Fubiao Weng ◽  
Songping Shen ◽  
Peijin Zheng ◽  
Gengbiao Xu ◽  
Zhiwei Qiu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Reduction Potential ◽  
Photophysical Properties ◽  
Photovoltaic Performance ◽  
Hole Mobility ◽  
Oxidation Potential ◽  
Initial Oxidation ◽  
Mobility Rate

Abstract Two novel D-π-A-π-D type non-fullerene acceptors (FPTC and CPTC) composed of fluorene or carbazole as acceptor unit, benzene as intermediates and 2-(6-oxo-5,6-dihydro-4H-cyclopenta[c] thiophen-4-ylidene) malononitrile (TC) as terminal groups are synthesized through only two procedures. Also, their electrochemical behavior, photophysical properties and photovoltaic performance are systematically characterized and thoroughly studied. In consequence, the FPTC has better performance than C PTC, and the PCE of this device based on FPTC: PTB7-Th is nearly 1% higher than that of CPTC: PTB7-Th device, reaching up to 1.09% with a V OC of 0.71 V, a J SC of 3.42 mA cm − 2 . The higher PCE of the device based on FPTC is attributed to the fact that this molecular has a wider absorption spectrum and a higher molar extinction coefficient nearly four times than that of CPTC, a higher initial oxidation potential, and a lower onset reduction potential. Also, the higher electron mobility rate and hole mobility rate contribute to the device based on FPTC better performances. Compared with carbazole, the fluorene as the acceptor unit provides potential possibilities for the construction of high-performance organic solar cells.

scholarly journals With PBDB-T as the Donor, the PCE of Non-Fullerene Organic Solar Cells Based on Small Molecule INTIC Increased by 52.4%

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1324 ◽  
Author(s):  
Weifang Zhang ◽  
Zicha Li ◽  
Suling Zhao ◽  
Zheng Xu ◽  
Bo Qiao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Short Circuit Current ◽  
Production Costs ◽  
Higher Carrier Mobility ◽  
Carrier Transportation

At present, most high-performance non-fullerene materials are centered on fused rings. With the increase in the number of fused rings, production costs and production difficulties increase. Compared with other non-fullerenes, small molecule INTIC has the advantages of easy synthesis and strong and wide infrared absorption. According to our previous report, the maximum power conversion efficiency (PCE) of an organic solar cell using PTB7-Th:INTIC as the active layer was 7.27%. In this work, other polymers, PTB7, PBDB-T and PBDB-T-2F, as the donor materials, with INTIC as the acceptor, are selected to fabricate cells with the same structure to optimize their photovoltaic performance. The experimental results show that the optimal PCE of PBDB-T:INTIC based organic solar cells is 11.08%, which, thanks to the open voltage (VOC) increases from 0.80 V to 0.84 V, the short circuit current (JSC) increases from 15.32 mA/cm2 to 19.42 mA/cm2 and the fill factor (FF) increases from 60.08% to 67.89%, then a 52.4% improvement in PCE is the result, compared with the devices based on PTB7-Th:INTIC. This is because the PBDB-T:INTIC system has better carrier dissociation and extraction, carrier transportation and higher carrier mobility.

scholarly journals All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Ruimin Zhou ◽  
Zhaoyan Jiang ◽  
Chen Yang ◽  
Jianwei Yu ◽  
Jirui Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
High Efficiency ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Photovoltaic System ◽  
Active Layers ◽  
Donor Acceptor

AbstractThe high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, and single-crystal structural analyses reveal its explicit molecular planarity and compact intermolecular packing. A promising narrow bandgap small-molecule with absorption edge of more than 930 nm along with our home-designed small molecule is selected as electron acceptors. To the best of our knowledge, the binary all-small-molecule OSCs achieve the highest efficiency of 14.34% by optimizing their hierarchical morphologies, in which the donor or acceptor rich domains with size up to ca. 70 nm, and the donor crystals of tens of nanometers, together with the donor-acceptor blending, are proved coexisting in the hierarchical large domain. All-small-molecule photovoltaic system shows its promising for high performance OSCs, and our study is likely to lead to insights in relations between bulk heterojunction structure and photovoltaic performance.

Asymmetrical squaraines for high-performance small-molecule organic solar cells with a short circuit current of over 12 mA cm−2

2015 ◽  
Vol 51 (28) ◽  
pp. 6133-6136 ◽  
Author(s):  
Yao Chen ◽  
Youqin Zhu ◽  
Daobin Yang ◽  
Qian Luo ◽  
Lin Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Short Circuit Current ◽  
Squaric Acid ◽  
Squaraine Dyes

Asymmetrical squaraine dyes with two aryl groups directly linked to the squaric acid core were synthesized, and exhibited excellent photovoltaic performance.

Synergistic effect of side-chain and backbone engineering in thieno[2,3-f]benzofuran-based conjugated polymers for high performance non-fullerene organic solar cells

2019 ◽  
Vol 7 (3) ◽  
pp. 958-964 ◽  
Author(s):  
Keke Dou ◽  
Xunchang Wang ◽  
Zurong Du ◽  
Huanxiang Jiang ◽  
Feng Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Synergistic Effect ◽  
Conjugated Polymers ◽  
Power Conversion Efficiency ◽  
Organic Solar Cells ◽  
High Performance ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Side Chain ◽  
Alkyl Side Chains

A series of copolymers containing thieno[2,3-f]benzofuran unit with different alkyl side chains are synthesized. The best photovoltaic performance with power conversion efficiency over 11% have been realized.

Low temperature aqueous solution-processed Li doped ZnO buffer layers for high performance inverted organic solar cells

2016 ◽  
Vol 4 (25) ◽  
pp. 6169-6175 ◽  
Author(s):  
Zhenhua Lin ◽  
Jingjing Chang ◽  
Chunfu Zhang ◽  
Jincheng Zhang ◽  
Jishan Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Solar Cells ◽  
Low Temperature ◽  
Buffer Layer ◽  
Organic Solar Cells ◽  
High Performance ◽  
Photovoltaic Performance ◽  
Buffer Layers ◽  
Solution Processed ◽  
Doped Zno

An enhanced photovoltaic performance is achieved by employing a lithium doped ZnO layer as the electron buffer layer for organic solar cells.

scholarly journals Recent advances in high-performance organic solar cells enabled by acceptor–donor–acceptor–donor–acceptor (A–DA′D–A) type acceptors

2020 ◽  
Vol 4 (12) ◽  
pp. 3487-3504 ◽  
Author(s):  
Jiajun Zhao ◽  
Chao Yao ◽  
Muhammad Umair Ali ◽  
Jingsheng Miao ◽  
Hong Meng
Keyword(s):  
Molecular Structure ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Photovoltaic Performance ◽  
Optoelectronic Properties ◽  
Recent Advances ◽  
Donor Acceptor

In this review, we focus on the recent advances in organic solar cells enabled by A–DA′D–A type acceptors and summarize the correlation between molecular structure, molecular packings, optoelectronic properties, and photovoltaic performance.

scholarly journals Boosting Photovoltaic Performance in Organic Solar Cells by Manipulating the Size of MoS2 Quantum Dots as a Hole-Transport Material

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1464
Author(s):  
Kwang Hyun Park ◽  
Sunggyeong Jung ◽  
Jungmo Kim ◽  
Byoung-Min Ko ◽  
Wang-Geun Shim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Quantum Confinement Effect ◽  
Critical Role ◽  
Photovoltaic Performance ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer

The design of photoactive materials and interface engineering between organic/inorganic layers play a critical role in achieving enhanced performance in energy-harvesting devices. Two-dimensional transitional dichalcogenides (TMDs) with excellent optical and electronic properties are promising candidates in this regard. In this study, we demonstrate the fabrication of size-controlled MoS2 quantum dots (QDs) and present fundamental studies of their optical properties and their application as a hole-transport layer (HTL) in organic solar cells (OSCs). Optical and structural analyses reveal that the as-prepared MoS2 QDs show a fluorescence mechanism with respect to the quantum confinement effect and intrinsic/extrinsic states. Moreover, when incorporated into a photovoltaic device, the MoS2 QDs exhibit a significantly enhanced performance (5/10-nanometer QDs: 8.30%/7.80% for PTB7 and 10.40%/10.17% for PTB7-Th, respectively) compared to those of the reference device (7.24% for PTB7 and 9.49% for PTB7-Th). We confirm that the MoS2 QDs clearly offer enhanced transport characteristics ascribed to higher hole-mobility and smoother root mean square (Rq) as a hole-extraction material. This approach can enable significant advances and facilitate a new avenue for realizing high-performance optoelectronic devices.

An effective π-extended squaraine for solution-processed organic solar cells with high efficiency

2016 ◽  
Vol 4 (48) ◽  
pp. 18931-18941 ◽  
Author(s):  
Daobin Yang ◽  
Hisahiro Sasabe ◽  
Yan Jiao ◽  
Taojun Zhuang ◽  
Yan Huang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
High Efficiency ◽  
Hole Mobility ◽  
Solution Processed ◽  
Photovoltaic Materials

A π-extension strategy is an effective way for squaraines for achieving high-performance photovoltaic materials capable of showing much enhanced hole mobility.

scholarly journals Nonfullerene Small-Molecule Acceptors with Extended Optical Absorption Based on the “Spliced” Strategy for Organic Solar Cells

2019 ◽  
Vol 01 (01) ◽  
pp. 071-077
Author(s):  
Di Zhou ◽  
Zhilin Liu ◽  
Dangqiang Zhu ◽  
Xiyue Yuan ◽  
Xichang Bao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Optical Absorption ◽  
Band Gap ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
Photovoltaic Performance ◽  
Wide Band ◽  
End Capping ◽  
New Perspective

How to broaden the optical absorption of photovoltaic materials is one of the key issues in the design of high-performance organic solar cells. Nowadays, the sunlight of 400–550 nm wavelength range is not effectively utilized for most small-molecule nonfullerene acceptors. In this work, we proposed the “spliced” strategy of combining the acceptor–donor–acceptor type narrow band-gap small molecules and wide-band-gap perylene diimide (PDI) moieties via a flexible alkyl chain linkage, which could give the superposition effect of the absorption spectra, and three small-molecule acceptors (S1, S2, and S3) were designed based on various end-capping groups with different electron withdrawing abilities. Encouragingly, the as-constructed molecules can well make use of 400–550 nm sunlight with two independent absorption regions. Meanwhile, the aggregation of S1 with a highly planar end-capping group was dominated by both the PDI unit and main skeleton, while S2 and S3 exhibited PDI-controlled aggregation. When fabricated into organic solar cells, S1-based devices achieved a superior efficiency of 3.41% in comparison with those of the other two. The poor photovoltaic performance could be attributed to severe PDI aggregation, which can hinder the charge transfer through the main skeletons. This work could provide a new perspective to modulate optical absorption through the spliced strategy.

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