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Core-Double Shell Nano-hybrids Designed by Multi-walled Carbon Nanotubes, Polyaniline and Polythiophenes in PBDT-DTNT:PC61BM Solar Cells
摘要： Core–mantle–shell supramolecules composed of carbon nanotube (CNT)-graft-polyaniline (PANI), poly(3-hexylthiophene) (P3HT), and poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) precursors were designed and utilized in PBDT-DTNT:phenyl-C61-butyric acid methyl ester (PC61BM) solar cells. Weight ratio of polymer:CNT-graft-PANI was 9:1 and the weight ratios were 1:1 in binary and 1:1:1 in ternary systems. Diameters of core(CNT)–mantle(PANI), core(CNT)–mantle(PANI)–shell(P3HT), and core(CNT)–mantle(PANI)–shell(PBDT-DTNT) nanostructures ranged in 75–90 nm, 145–160 nm, and 120–130 nm, respectively. Efficacies of 6.82% (13.92 mA/cm2, 0.71 V, 69%, 7.1 9 10?3 cm2/V s and 1.9 9 10?2 cm2/V s) and 7.60% (14.66 mA/cm2, 0.73 V, 71%, 9.0 9 10?3 cm2/V s and 3.4 9 10?2 cm2/V s) were acquired for photovoltaics based on the nanostructures having PBDT-DTNT and P3HT shells, respectively. The PANI mantle may act as both acceptor (accepting the electrons from core) and donor (donating the electrons to shell) in the configuration of core–mantle–shell supramolecules. The P3HT shells acted better than the PBDT-DTNT ones, originated from the simple structure of P3HT backbones and their more ordered and thicker shells, and thus had larger charge mobilities and currents.
关键词： core–mantle–shell,photovoltaic device,PANI,PBDT-DTNT,P3HT
更新于2025-09-19 17:13:59
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Elevated air stability in PBDT-DTNT:PCBM solar cells by focusing on roles of fibrillar/patterned nanostructures via graphene/polymer constituents
摘要： Morphological, electrochemical, and photovoltaic stabilities of the poly[benzodithiophene-bis(decyltetradecylthien) naphthothiadiazole] (PBDT-DTNT):phenyl-C61-butyric acid methyl ester (PC71BM) solar cells were promoted by the pre-designed supramolecules on the basis of reduced graphene oxide (rGO) nanosheets. Nanostructures consisted of the pristine rGO, grafted-rGO/PBDT-DTNT, rGO-polythiophene (GPTh) electrospun nanofiber, grafted-rGO/PBDT-DTNT electrospun nanofiber and rGO/PBDT-DTNT samples. The reduction in photovoltaic characteristics during air aging was the steepest for the unmodified PBDT-DTNT:PC71BM solar cells. From rGO based photovoltaics towards the rGO/PBDT-DTNT modified ones possessing the well-patterned PBDT-DTNT nanofibers, the slopes of graphs decreased. The most stabilized devices were fabricated on the basis of PBDT-DTNT:PC71BM:rGO/PBDT-DTNT active layers (power conversion efficiency (PCE) from 6.09% for upon-fabricated to 4.87% for 1 month aged systems) for having the most red-shifted and intensified absorbance, the largest phase separation, the lowest impedance responses and the highest photovoltaic characteristics during 1 month air aging (short circuit current density (Jsc) of 12.09 mA/cm2, fill factor (FF) of 63%, open circuit voltage (Voc) of 0.64 V, hole mobility (μh) of 5.3 × 10–5 cm2/V s, electron mobility (μe) of 7.9 × 10–4 cm2/V s, charge transfer resistance (Rtr) of 431 Ω cm2 and PCE of 4.87%). The GPTh/PBDT-DTNT/PC71BM (Jsc = 10.31 mA/cm2, FF = 49%, Voc = 0.55 V, Rtr = 796 Ω cm2 and PCE = 2.78%) and grafted-rGO/PBDT-DTNT/PBDT-DTNT (Jsc = 10.98 mA/cm2, FF = 56%, Voc = 0.60 V, Rtr = 539 Ω cm2 and PCE = 3.69%) electrospun nanofibers also imparted the stabilization of devices within 1 month.
关键词： Stability,rGO,Supramolecule,PBDT-DTNT
更新于2025-09-16 10:30:52