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Proceedings Paper

Effect of thermal annealing on the structure of the small molecule (electro-donor) DRCN5T: tunneling spectroscopies analysis
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Paper Abstract

Post-treatments of the organic solar cells (OSCs) active layers, such as thermal, solvent vapor and applied external electric field, can lead to very different morphologies that directly impact the power conversion efficiency (PCE) of the OSCs. These post-treatments could improve bulk morphology, which reduce charge carrier recombination and, therefore, improving the photovoltaic performance of bulk heterojunction (BHJ). Here, thin solid films of the small molecule DRCN5T and DRCN5T:[70]PCBM blend, were analyzed through scanning tunneling microscopy (STM) and spectroscopy (STS) after different temperatures treatments. DRCN5T is an electro-donor compound used in the OSCs active layer, which reach ~10% of PCE. These very thin solid films (monolayers) exhibit a worm-like pattern without thermal annealing (TA) (amorphous behavior), however after applying TA at 120°C, the small molecule crystallizes: its structural geometry becomes a well-defined organized one.

Paper Details

Date Published: 14 September 2018
PDF: 9 pages
Proc. SPIE 10737, Organic, Hybrid, and Perovskite Photovoltaics XIX, 107372S (14 September 2018); doi: 10.1117/12.2322722
Show Author Affiliations
Irving Caballero-Quintana, Centro de Investigaciones en Óptica, A.C. (Mexico)
Daniel Romero-Borja, Centro de Investigaciones en Óptica, A.C. (Mexico)
José-Luis Maldonado, Centro de Investigaciones en Óptica, A.C. (Mexico)

Published in SPIE Proceedings Vol. 10737:
Organic, Hybrid, and Perovskite Photovoltaics XIX
Zakya H. Kafafi; Paul A. Lane; Kwanghee Lee, Editor(s)

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