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Issue 37, 2016
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High performance all-small-molecule solar cells: engineering the nanomorphology via processing additives

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Abstract

The use of small volumes of solvent additives (SAs) or little amounts of non-volatile additives is a processing approach that has been implemented in many high/record performing bulk heterojunction (BHJ) organic solar cells (OSCs). Here, the effects of six SA systems and a molecular additive di-2-thienyl-2,1,3-benzothiadiazole (DTBT) were studied with respect to the photovoltaic parameters of solution-processed all small molecule solar cells (all-SMSCs) based on the BDTT-S-TR:NIDCS-MO system. An effective strategy with binary additives has been employed in this all-SM system, where a small amount, 0.75 vol% 1,8-diiodooctane (DIO) and 2 wt% DTBT were added to the casting solution. This efficient SA approach yielded the highest power conversion efficiency (PCE) of 5.33%. The relevant additives facilitate phase separation in the nm domains and improve bulk transport as evidenced by photoluminescence (PL), atomic force microscopy (AFM), X-ray diffraction (XRD) and space charge limited current (SCLC) measurements.

Graphical abstract: High performance all-small-molecule solar cells: engineering the nanomorphology via processing additives

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Supplementary files

Article information


Submitted
23 Jun 2016
Accepted
17 Aug 2016
First published
17 Aug 2016

J. Mater. Chem. A, 2016,4, 14234-14240
Article type
Paper

High performance all-small-molecule solar cells: engineering the nanomorphology via processing additives

J. Min, O. K. Kwon, C. Cui, J. Park, Y. Wu, S. Y. Park, Y. Li and C. J. Brabec, J. Mater. Chem. A, 2016, 4, 14234
DOI: 10.1039/C6TA05303C

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