Comparison studies between BHBT2:PC71BM composite nanotubes and its bulk-heterojunction properties

TL;DR

This study compares the morphological, structural, and optical properties of BHBT2:PC71BM bulk-heterojunction and composite nanotubes, revealing differences in charge transfer efficiency and material infiltration.

Contribution

It provides a comparative analysis of two fabrication methods and their impact on the properties of BHBT2:PC71BM nanotubes, highlighting the advantages and limitations of each.

Findings

Charge transfer is more efficient in bulk-heterojunction nanotubes.

Carbon-rich PC71BM successfully infiltrates BHBT2 nanotubes.

Absorption spectra fall within the UV-vis range for both structures.

Abstract

In this study, we investigate the morphological, structural, and optical properties of both bulk-heterojunction and composite nanotubes that composed of thiophene-based small molecules BHBT2 and fullerene PC71BM. Mix-blended and template-assisted methods were used to fabricate the bulk-heterojunction and composite nanotubes, respectively. A single material of BHBT2 thin films and nanotubes that fabricated via spin-coating and template-assisted methods, respectively, was also studied. Two different formations between bulk-heterojunction and composite nanotubes were compared to elaborate their advancement in properties. Absorption spectra of BHBT2:PC71BM bulk-heterojunction and composite nanotubes have fallen within the ultraviolet-visible (UV-vis) range. Field emission scanning electron microscope (FESEM) and high-resolution transmission electron microscope (HRTEM) images show that the carbon-rich of PC71BM, has successfully infiltrated into the BHBT2 nanotube to form the BHBT2:PC71BM composite nanotubes. However, due to the informality distribution of infiltration, charge carrier transfer is seen to be better in bulk-heterojunction rather than in the composite nanotubes.