A thieno[3,4-b]thiophene linker enables a low-bandgap fluorene-cored molecular acceptor for efficient non-fullerene solar cells†,Materials Chemistry Frontiers

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A thieno[3,4-b]thiophene linker enables a low-bandgap fluorene-cored molecular acceptor for efficient non-fullerene solar cells†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1039/c7qm00585g
Haijun Fan _{1,

2,

3} , Thomas Vergote _{1,

2,

3} , Shengjie Xu _{1,

2,

3} , Shanshan Chen _{4,

5,

6} , Changduk Yang _{4,

5,

6} , Xiaozhang Zhu _{1,

2,

3,

7,

8}

Affiliation

A low-bandgap small-molecule acceptor NFTI with a fluorene central core, 2-(2,3-dihydro-3-oxo-1H-inden-1-ylidene) propane-dinitrile end groups and thieno[3,4-b]thiophene linkers was designed and synthesized for bulk-heterojunction organic solar cell applications. NFTI exhibits broad absorption with a low optical bandgap of approximately 1.57 eV in the thin film state. An optimized power conversion efficiency (PCE) of 9.02% with a high short-circuit current of 17.8 mA cm⁻² was achieved with diphenyl ether (DPE) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) binary-processing additives. According to the detailed morphological investigation, we found that binary-processing additives helped to reduce the size of nanocrystals and enhance the intermolecular interaction, which led to improved charge separation and transport in the BHJ thin film, and thus achieved high device performance.

中文翻译：

噻吩并[3,4- b ]噻吩连接子可实现低带隙芴核分子接受体，从而形成高效的非富勒烯太阳能电池†

低带隙小分子受体NFTI，具有芴中心核，2-（2,3-二氢-3-氧代-1 H-茚满-1-亚烷基）丙烷可稀释的端基和噻吩并[3,4- b设计并合成了]噻吩连接体，用于体异质结有机太阳能电池应用。NFTI在薄膜状态下具有约1.57 eV的低光学带隙，显示出广泛的吸收性。最佳的电源转换效率（PCE）为9.02％，短路电流为17.8 mA cm ^-2用二苯醚（DPE）和2,3,5,6-四氟-7,7,8,8-四氰基喹二甲烷（F4-TCNQ）二元加工助剂可以实现。根据详细的形态学研究，我们发现二元加工助剂有助于减小纳米晶体的尺寸并增强分子间的相互作用，从而改善了BHJ薄膜中的电荷分离和传输，从而获得了较高的器件性能。

更新日期：2018-01-18

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