Enhanced open circuit voltage of small molecule acceptors containing angular-shaped indacenodithiophene units for P3HT-based organic solar cells†,Journal of Materials Chemistry C

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Enhanced open circuit voltage of small molecule acceptors containing angular-shaped indacenodithiophene units for P3HT-based organic solar cells†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-11-01 00:00:00 , DOI: 10.1039/c8tc04608e
Hongyan Huang _{1,

2,

3,

4,

5} , Bo Xiao _{6,

7,

8,

9,

10} , Chengting Huang _{1,

2,

3,

4,

5} , Jing Zhang _{1,

2,

3,

4,

5} , Shuli Liu _{1,

2,

3,

4,

5} , Nina Fu _{1,

2,

3,

4,

5} , Baomin Zhao _{1,

2,

3,

4,

5} , Tianshi Qin _{3,

4,

11,

12,

13} , Erjun Zhou _{6,

7,

8,

9,

10} , Wei Huang _{1,

2,

3,

4,

5}

Affiliation

Angular indaceno[2,1-b:6,5-b′]dithiophene (a-IDT) as an analogue of linear-IDT (l-IDT), in which the central phenyl ring was linked to the β-position of the thiophene ring but fused on its α-position, was designed and exploited via intramolecular annulation. Two A–D–A type small molecule acceptors (SMAs) l-IDTBTRh and a-IDTBTRh, with l-IDT and a-IDT as the central cores, benzothiadiazole (BT) as the π-bridge acceptor segments and 3-ethylrhodanine as the end-capping groups, were synthesized and employed for P3HT-based fullerene free organic solar cells. The geometric shape of the l-IDT and a-IDT subunits plays a pivotal role in governing the optoelectronic properties, the charge mobility, the morphology and the photovoltaic performance of the resulting acceptors. Preliminarily, the device based on P3HT/l-IDTBTRh (1 : 08, w/w) displayed a circuit current density (J_sc) of 8.81 mA cm⁻², an open-circuit voltage (V_oc) of 0.86 V and a fill factor (FF) of 71.0%, delivering a decent PCE of 5.38%, which is associated with the lower bandgap, the better charge mobility and the morphology. Despite the inferior photovoltaic performance (2.53%), solar cells based on BHJ blends of a-IDTBTRh and P3HT offer a remarkably higher V_oc of 0.92 V as a result of the high-lying LUMO energy level (−3.59 eV), representing one of the highest values among the reported IDT-based A–D–A type SMAs for solar cells containing P3HT. The results suggested that introducing an a-IDT segment as the central core into A–D–A type SMAs can effectively increase the LUMO energy level of SMAs, offering an efficient strategy to design non-fullerene small molecule acceptors with high V_oc based-P3HT organic solar cells.

中文翻译：

包含角形茚并二噻吩单元的小分子受体的开路电压提高，用于P3HT基有机太阳能电池†

角吲哚并[2,1- b：6,5- b ']二噻吩（a-IDT）作为线性-IDT （l-IDT）的类似物，其中中心苯环连接到α- IDT的β位通过分子内环化设计并利用了噻吩环但在其α位置稠合的噻吩环。两个A–D–A型小分子受体（SMA）l-IDTBTRh和a-IDTBTRh，以l-IDT和a-IDT为中心核，苯并噻二唑（BT）作为π桥受体链段，而3-乙基罗丹宁为合成了封端基团，并将其用于基于P3HT的不含富勒烯的有机太阳能电池。l-IDT的几何形状和A-IDT亚基起着支配光电特性，电荷迁移率，形态和所得到的受体的光伏性能起关键作用。最初，基于P3HT / l-IDTBTRh（1:08，w / w）的设备显示出8.81 mA cm ^-2的电路电流密度（J _sc），0.86 V的开路电压（V _oc）和填充因子（FF）为71.0％，实现了5.38％的体面PCE，这与较低的带隙，更好的电荷迁移率和形态有关。尽管光伏性能较差（2.53％），基于a-IDTBTRh和P3HT的BHJ混合物的太阳能电池仍具有明显更高的V _oc较高的LUMO能级（-3.59 eV）产生0.92 V的电压，这是报道的含P3HT的基于IDT的A–D–A型SMA SMA中最高的值之一。结果表明，将a-IDT区段作为中心核心引入A–D–A型SMA可以有效提高SMA的LUMO能级，为设计基于V _oc的非富勒烯小分子受体提供了有效策略，P3HT有机太阳能电池。

更新日期：2018-11-01

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