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Abstract
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To increase internal donor–acceptor interfaces and highlight the influence of ordering of donor–acceptor components inside fibers,
novel blend fibrous structures comprising unsettled poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT):
grafted-reduced graphene oxide (rGO) nanofibers, settled PBDT-DTNT/grafted-rGO nanofibers including PBDT-DTNT, and settled PBDTDTNT/grafted-rGO nanofibers excluding PBDT-DTNT were prepared and embedded in photovoltaics. Hence, three-dimensional nonwoven
network morphologies of triple electrospun fibers were acquired using electrospinning. Average diameter and conductivity of PBDT-DTNT:
grafted-rGO, PBDT-DTNT/grafted-rGO:PBDT-DTNT, and PBDT-DTNT/grafted-rGO fibers ranged in 200–250 and 1.1–1.6 × 10−9 S cm−1,
150–190 and 9.2–9.5 × 10−7 S cm−1, and 60–80 nm and 3.3–3.7 × 10−10 S cm−1, respectively. Photoluminescence quenching and thus
donating–accepting characteristic of settled PBDT-DTNT/grafted-rGO nanofibers including PBDT-DTNT were more intensified, resulting
from greater internal interfaces. Through blending PBDT-DTNT/grafted-rGO supramolecules with PBDT-DTNT chains and embedding them
in PBDT-DTNT:phenyl-C71-butyric acid methyl ester (PC71BM) thin films, the best results were obtained. Short-circuit current density (Jsc),
open circuit voltage (Voc), fill factor (FF), and power conversion efficiency (PCE) were 12.18 mA cm−2, 0.66 V, 65%, and 5.22%, respectively.
Nanofiber template not only acted as guide path for charge transport but also increased interfacial area between donor and acceptor to induce
more exciton dissociation. Inclusion of PBDT-DTNT donor chains into blend nanofibers increased donor–acceptor interface in organic filaments.
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