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Studying the effect of high substrate temperature on the microstructure of vacuum evaporated TAPC: C60 organic solar thin films

DOI: 10.3390/ma14071733 DOI Help

Authors: Mohamed Abdelaal (Ain Shams University; University of Oxford) , Mohamed Hazem Abdellatif (Ain Shams University) , Moritz Riede (University of Oxford) , Ghada Bassioni (Ain Shams University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materials , VOL 14

State: Published (Approved)
Published: April 2021
Diamond Proposal Number(s): 26630

Open Access Open Access

Abstract: Organic solar cells (OSCs), also known as organic photovoltaics (OPVs), are an emerging solar cell technology composed of carbon-based, organic molecules, which convert energy from the sun into electricity. Key for their performance is the microstructure of the light-absorbing organic bulk heterojunction. To study this, organic solar films composed of both fullerene C60 as electron acceptor and different mole percentages of di-[4-(N,N-di-p-tolyl-amino)-phenyl]-cyclohexane (TAPC) as electron donor were evaporated in vacuum in different mixing ratios (5, 50 and 95 mol%) on an ITO-coated glass substrate held at room temperature and at 110 °C. The microstructure of the C60: TAPC heterojunction was studied by grazing incidence wide angle X-ray scattering to understand the effect of substrate heating. By increasing the substrate temperature from ambient to 110 °C, it was found that no significant change was observed in the crystal size for the C60: TAPC concentrations investigated in this study. In addition to the variation done in the substrate temperature, the variation of the mole percent of the donor (TAPC) was studied to conclude the effect of both the substrate temperature and the donor concentration on the microstructure of the OSC films. Bragg peaks were attributed to C60 in the pure C60 sample and in the blend with low donor mole percentage (5%), but the C60 peaks became nondiscernible when the donor mole percentage was increased to 50% and above, showing that TAPC interrupted the formation of C60 crystals.

Journal Keywords: renewable energy; organic semiconductors; organic solar cells; vacuum evaporation; X-ray diffraction; microstructure

Diamond Keywords: Photovoltaics

Subject Areas: Chemistry, Energy, Environment

Instruments: I07-Surface & interface diffraction

Added On: 13/04/2021 15:00


Discipline Tags:

Organic Chemistry Earth Sciences & Environment Climate Change Energy Sustainable Energy Systems Materials Science Energy Materials Physics Surfaces interfaces and thin films Chemistry

Technical Tags:

Diffraction Grazing Incidence X-ray Diffraction (GIXD)