Application of small molecules based on a dithienogermole core in bulk heterojunction organic solar cells and perovskite solar cells,Materials Chemistry Frontiers

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Application of small molecules based on a dithienogermole core in bulk heterojunction organic solar cells and perovskite solar cells
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-05-20 , DOI: 10.1039/d0qm00267d
B. Yadagiri _{1,

2,

3,

4,

5} , K. Narayanaswamy _{1,

2,

3,

4,

5} , Towhid H. Chowdhury _{6,

7,

8,

9,

10} , Ashraful Islam _{6,

7,

8,

9,

10} , Vinay Gupta _{5,

11,

12,

13} , Surya Prakash Singh _{1,

2,

3,

4,

5}

Affiliation

We report the synthesis and characterization of a dithienogermole (DTGe) based small molecule, named Ge-PO-2CN, as a donor material for bulk heterojunction (BHJ) organic solar cells (OSCs) and as a hole transport material (HTM) for dopant-free perovskite solar cells (PSCs). This molecule consists with a high planar and electron rich DTGe core as a central core unit and covalently linked with an electron rich phenoxazine group. Finally, it is end-capped with electron-deficient malononitrile group. This molecule was synthesized by a facile synthetic protocol, without using costly and complicated purification techniques. The Ge-PO-2CN compound has a suitable HOMO level with respect to the valence band of the perovskite absorber and the BHJ OSCs. The BHJ OSC device made with Ge-PO-2CN as the donor and PC₇₁BM as an acceptor results in a power conversion efficiency (PCE) of 5.4%. Subsequently, the PSC with an active area of 1.02 cm² constructed with dopant-free Ge-PO-2CN as an HTM achieved a PCE of up to 11.63%.

中文翻译：

基于双硫杂诺核的小分子在整体异质结有机太阳能电池和钙钛矿太阳能电池中的应用

我们报告合成和表征的二硫代锗烷（DTGe）为基础的小分子，称为Ge-PO-2CN，作为体异质结（BHJ）有机太阳能电池（OSCs）的供体材料和作为掺杂剂的空穴传输材料（HTM）钙钛矿太阳能电池（PSC）。该分子由高平面和富电子的DTGe核作为中心核心单元，并与富电子的吩恶嗪基团共价连接。最后，它被缺电子的丙二腈基团封端。该分子是通过简便的合成方案合成的，无需使用昂贵且复杂的纯化技术。在葛-PO-2 CN该化合物相对于钙钛矿吸收剂和BHJ OSC的价带具有合适的HOMO能级。以Ge-PO-2CN作为供体，PC ₇₁ BM作为受体的BHJ OSC器件的功率转换效率（PCE）为5.4％。随后，以无掺杂的Ge-PO-2CN作为HTM构造的有源面积为1.02 cm ²的PSC的PCE高达11.63％。

更新日期：2020-07-02

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