|
Abstract
|
Super-connected nanostructures were developed through bridging reduced graphene oxide (rGO)
nanosheets with poly[benzodithiophene-bis(decyltetradecyl-thien)naphthothiadiazole] (PBDT-DTNT)
and poly[bis(triiso-propylsilylethynyl)benzodithiophene-bis(decyltetradecyl-thien)naphthobisthiadiazole]
(PBDT-TIPS-DTNT-DT) polymers. The higher tendency of conjugated polymers towards the rGO surface
increased the thickness of super-connections up to 9–12 nm. The red-shifted and more intensified
identifying peaks in ultraviolet-visible spectra and more quenched photoluminescence spectra of
PBDT-DTNT/rGO nano-hybrids were ascribed to better p-stacking of PBDT-DTNT chains compared to
PBDT-TIPS-DTNT-DT ones onto rGO nanosheets and their stronger donating–accepting features.
The presence of TIPS side structures made the arrangement of PBDT-TIPS-DTNT-DTs more difficult. The
donor–acceptor nano-hybrids were subsequently applied in the active layers of photovoltaic devices in pure
and mixed states with the PBDT-DTNT and PBDT-TIPS-DTNT-DT complex polymers. These types of
innovatively designed nanostructures eliminate the need for phenyl-C-butyric acid methyl ester (PCBM) and
similar acceptor components. In contrast to poly(3-hexylthiophene) (P3HT)-based delicate morphologies, the
active layers based on complex polymers such as PBDT-DTNT and PBDT-TIPS-DTNT-DT reflected coarser
phase separations. Super-connected rGO nanosheets templated larger phase separations particularly in the
presence of donor polymer chains, and thereby high performance photovoltaics were acquired. The bestperforming devices based on PBDT-DTNT/rGO + PBDT-DTNT reflected 11.15 mA cm2, 0.67 V, 64% and
4.78% characteristics. External quantum efficiency (EQE) experiments also verified the well-performing
photovoltaics based on complex polymers.
|