Journal ArticleDOI
Efficient Nonfullerene Polymer Solar Cells Enabled by a Novel Wide Bandgap Small Molecular Acceptor.
Guangjun Zhang,Guofang Yang,He Yan,Joo-Hyun Kim,Harald Ade,Wenlin Wu,Xiaopeng Xu,Yuwei Duan,Qiang Peng +8 more
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TLDR
A wide bandgap small molecular acceptor, SFBRCN, containing a 3D spirobifluorene core flaked with a 2,1,3-benzothiadiazole (BT) and end-capped with highly electron-deficient RCN units, has been successfully synthesized as a small molecularacceptor (SMA) for nonfullerene polymer solar cells (PSCs).Abstract:
A wide bandgap small molecular acceptor, SFBRCN, containing a 3D spirobifluorene core flaked with a 2,1,3-benzothiadiazole (BT) and end-capped with highly electron-deficient (3-ethylhexyl-4-oxothiazolidine-2-yl)dimalononitrile (RCN) units, has been successfully synthesized as a small molecular acceptor (SMA) for nonfullerene polymer solar cells (PSCs). This SMA exhibits a relatively wide optical bandgap of 2.03 eV, which provides a complementary absorption to commonly used low bandgap donor polymers, such as PTB7-Th. The strong electron-deficient BT and RCN units afford SFBRCN with a low-lying LUMO (lowest unoccupied molecular orbital) level, while the 3D structured spirobifluorene core can effectively suppress the self-aggregation tendency of the SMA, thus yielding a polymer:SMA blend with reasonably small domain size. As the results of such molecular design, SFBRCN enables nonfullerene PSCs with a high efficiency of 10.26%, which is the highest performance reported to date for a large bandgap nonfullerene SMA.read more
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Journal ArticleDOI
Non-fullerene acceptors for organic solar cells
TL;DR: Non-fullerene acceptors (NFAs) are currently a major focus of research in the development of bulk-heterojunction organic solar cells (OSCs) as mentioned in this paper.
Journal ArticleDOI
Nonfullerene Acceptor Molecules for Bulk Heterojunction Organic Solar Cells
Guangye Zhang,Jingbo Zhao,Philip C. Y. Chow,Kui Jiang,Jianquan Zhang,Zonglong Zhu,Jie Zhang,Fei Huang,He Yan,He Yan +9 more
TL;DR: Progress is summarized, aiming to describe the molecular design strategy, to provide insight into the structure-property relationship, and to highlight the challenges the field is facing, with emphasis placed on most recent nonfullerene acceptors that demonstrated top-of-the-line photovoltaic performances.
Journal ArticleDOI
Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors.
Hao Zhang,Huifeng Yao,Junxian Hou,Jie Zhu,Jianqi Zhang,Wanning Li,Runnan Yu,Bowei Gao,Shaoqing Zhang,Jianhui Hou,Jianhui Hou +10 more
TL;DR: Chlorination demonstrates effective ability in enhancing the device performance and facile synthesis route, which both deserve further exploitation in the modification of photovoltaic materials.
Journal ArticleDOI
Realizing Over 13% Efficiency in Green-Solvent-Processed Nonfullerene Organic Solar Cells Enabled by 1,3,4-Thiadiazole-Based Wide-Bandgap Copolymers
TL;DR: Two novel wide-bandgap copolymers, PBDT-TDZ and PBDTS- TDZ, are developed based on 1,3,4-thiadiazole (TDZ) and benzo[1,2-b:4,5-b']dithiophene (BDT) building blocks, which exhibit the stronger optical absorption, lower-lying HOMO level, and higher crystallinity.
Journal ArticleDOI
Improved Charge Transport and Reduced Nonradiative Energy Loss Enable Over 16% Efficiency in Ternary Polymer Solar Cells
TL;DR: This work suggests that utilizing the complementary advantages of fullerene and NFAs is a promising way to finely tune the detailed photovoltaic parameters and further improve the PCEs of PSCs.
References
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Journal ArticleDOI
A Nonfullerene Small Molecule Acceptor with 3D Interlocking Geometry Enabling Efficient Organic Solar Cells.
TL;DR: By employing both a novel polymer donor and a nonfullerene small-molecule acceptor in the solution-processed organic solar cells, a high-power conversion efficiency of close to 6% is demonstrated.
Journal ArticleDOI
Nanomorphology of bulk heterojunction photovoltaic thin films probed with resonant soft X-ray scattering.
Sufal Swaraj,Cheng Wang,Hongping Yan,Benjamin Watts,Jan Lüning,Christopher R. McNeill,Harald Ade +6 more
TL;DR: Resonant soft X-ray scattering is used to show that lack of morphological control contributes to the relatively poor performance of the all-polymer PFB/F8BT devices and may be problematic for all- polymer devices in general.
Journal ArticleDOI
Fine‐Tuning the 3D Structure of Nonfullerene Electron Acceptors Toward High‐Performance Polymer Solar Cells
Haiyan Li,Ye-Jin Hwang,Brett A. E. Courtright,Frank N. Eberle,Selvam Subramaniyan,Samson A. Jenekhe +5 more
TL;DR: Arylene linkers in a series of new tetraaza-benzodifluoranthene diimide dimers enable tuning of the 3D molecular structure of nonfullerene electron acceptors, facilitating observation of dramatic variation of the power conversion efficiency as the twist angle between the monomeric building blocks in the dimer is varied.
Journal ArticleDOI
Energy Level Tuning of Non-Fullerene Acceptors in Organic Solar Cells
Kjell Cnops,German Zango,Jan Genoe,Paul Heremans,M. Victoria Martínez-Díaz,Tomás Torres,Tomás Torres,David Cheyns +7 more
TL;DR: It is found that non-fullerene acceptors require adjusted buffer layers with aligned electron transport levels to enable efficient charge extraction, while the insertion of an exciton-blocking layer at the anode interface further boosts photocurrent generation.
Journal ArticleDOI
π-Bridge-Independent 2-(Benzo[c][1,2,5]thiadiazol-4-ylmethylene)malononitrile-Substituted Nonfullerene Acceptors for Efficient Bulk Heterojunction Solar Cells
Kai Wang,Yuliar Firdaus,Maxime Babics,Federico Cruciani,Qasim Saleem,Abdulrahman El Labban,Maha A. Alamoudi,Tomasz Marszalek,Wojciech Pisula,Wojciech Pisula,Frédéric Laquai,Pierre M. Beaujuge +11 more
TL;DR: In this article, the authors show that 2-(benzo[c][1,2,5]thiadiazol-4-ylmethylene)malononitrile (BM)-terminated SM acceptors can achieve efficiencies as high as 5.3% in BHJ solar cells with the polymer donor PCE10.