Naslov
A GISWAXS study on supramolecular assembly of small molecule electron donating photoabsorbers

Autori
Radovanović-Perić, Floren ; Vuk, Dragana ; Mandić, Vilko ; Rath, Thomas

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
28HSKIKI Book of Abstracts / Rogošić, Marko - , 2023, 205-205

Skup
28. Hrvatski skup kemičara i kemijskih knženjera

Mjesto i datum
Rovinj, Hrvatska, 28.03.2023. - 31.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Organic solar cells, electron transport, thin films

Sažetak
Nowadays, organic photovoltaic devices are receiving increased attention due to combination of their comparatively simple and cost effective processing and the ability to derive low weight, flexible thin-film solar cells for both indoor and outdoor application. Exciton generation and charge carrier recombination in such devices are influenced by multiple factors such as donor to acceptor ratio, energy offsets in the active layer (HOMO/LUMO) as well as energy alignment at the electron and hole transport layer interface, and lastly, active layer morphology. A good bulk heterojunction (active layer) needs to fully utilize excitons generated through the absorption of the acceptor and donor blend by converting the charge carrier flux into current at quantum yields as high as possible. Important parameters for this process are electron and hole mobilities, which often depend upon the crystallinity of the material inside the active layer as well as upon the crystal interconnectedness throughout the layer. These factors can be controlled through a variety of approaches out of which the molecular design is deemed to be the most important one nowadays. Here, we dedicated a study to spontaneous supramolecular assembly and thin film crystallization from solution by dropcasting of symmetric and asymmetric aminosquaraine derivatives to investigate the influence of various substituents on π-π stacking, preferential orientation and overall order of crystallinity. The synthesized compounds were characterized through cyclic voltammetry and UV-Vis spectroscopy, while thin films were fabricated for Grazing Incidence Small and Wide Angle X-ray Scattering (GISAXS and GIWAXS) using a 2D detector. The results revealed important information on crystallization suppression regarding volume hindrances caused by the extension of the chain. Moreover, the correlation between planarity of the molecule and quantity of the π-π bonds was discussed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Kemijsko inženjerstvo, Temeljne tehničke znanosti, Interdisciplinarne tehničke znanosti

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