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Issue 7, 2020
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Application of small molecules based on a dithienogermole core in bulk heterojunction organic solar cells and perovskite solar cells

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Abstract

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%.

Graphical abstract: Application of small molecules based on a dithienogermole core in bulk heterojunction organic solar cells and perovskite solar cells

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Supplementary files

Article information


Submitted
25 Apr 2020
Accepted
13 May 2020
First published
20 May 2020

Mater. Chem. Front., 2020,4, 2168-2175
Article type
Research Article

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

B. Yadagiri, K. Narayanaswamy, T. H. Chowdhury, A. Islam, V. Gupta and S. P. Singh, Mater. Chem. Front., 2020, 4, 2168
DOI: 10.1039/D0QM00267D

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