Ternary Blend Polymer Solar Cells Based on Wide-bandgap Polymer PDCBT and Low-bandgap Polymer PTB7-Th

Kim, Hyung Do; Shimizu, Ryosuke; Ohkita, Hideo

doi:10.1246/cl.180420

Cited by 8 publications

(1 citation statement)

References 21 publications

(31 reference statements)

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“…Among them, adopting ternary-based PSCs can be considered one of the most promising strategies to manipulate/fine-tune the PV performance parameters of the PSCs [22,23]. Recently, a ternary photoactive blend system (D/D/A, D/A/A) featuring a low-bandgap material with broad absorption spectra has been realized as a potential strategy to improve optical absorption, optimize the exciton separation, and charge carrier extraction in active layer with an aim of enhancing the J sc and other performance parameters of PSCs [24,25,26,27]. Herein, we explored a new kind of unexplored low-bandgap polymer, poly[ N -9-hepta-decanyl-2,7-carbazole-alt-3,6-bis-(thiophen-5-yl)-2,5-dioctyl-2,5-dihydropyrrolo[3,4]pyrrole-1,4-dione] (PCBTDPP, Figure 1a), as an efficient donor into P3HT:PC 61 BM active system to construct high-efficiency ternary PV devices with the device architecture (Figure 1b): indium tin oxide (ITO) glass/poly (3,4-ethylene dioxythiophene): poly (styrene sulfonate) (PEDOT:PSS)/binary or ternary photoactive blend system/Al.…”

Section: Introductionmentioning

confidence: 99%

Employing PCBTDPP as an Efficient Donor Polymer for High Performance Ternary Polymer Solar Cells

Saianand

Roy

et al. 2019

Polymers

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A compatible low-bandgap donor polymer (poly[N-90-heptadecanyl-2,7carbazole-alt-3,6-bis(thiophen-5-yl)-2,5-dioctyl-2,5-dihydropyrrolo[3,4]pyrrole-1,4-dione], PCBTDPP) was judicially introduced into the archetypal poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) photoactive system to fabricate highly efficient ternary based bulk heterojunction polymer solar cells (PSCs). The PCBTDPP ternary-based PSC with optimal loading (0.2 wt.%) displayed outstanding performance with a champion power conversion efficiency (PCE) of 5.28% as compared to the PCE (4.67%) for P3HT:PC61BM-based PSC (reference). The improved PCE for PCBTDPP ternary-based PSC can be mainly attributed to the incorporation of PCBTDPP into P3HT:PC61BM that beneficially improved the optical, morphological, electronic, and photovoltaic (PV) performance. This work instills a rational strategy for identifying components (donor/acceptor (D/A) molecules) with complementary beneficial properties toward fabricating efficient ternary PSCs.

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Section: Introductionmentioning

confidence: 99%

Employing PCBTDPP as an Efficient Donor Polymer for High Performance Ternary Polymer Solar Cells

Saianand

Roy

et al. 2019

Polymers

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Enhanced Charge Transport in a Conjugated Polymer Blended with an Insulating Polymer

Kim

Iriguchi

Fukuhara

et al. 2020

Chemistry An Asian Journal

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Herein, hole transport in a quinoxaline-thiophene based conjugated polymer (PTQ1) mixed with an insulating polystyrene (PS) was studied by macroscopic and local current density-voltage characteristics measurements. As a result, we found that hole conductivity in PTQ1:PS blends increases as the weight ratio of PTQ1 is reduced down to 20 wt%. This is mainly ascribed to increases in mobility because the charge carrier density would be constant in the insulating PS matrix. With decreasing PTQ1 weight ratio in the blends, the absorption bandwidth of PTQ1 and additional emission due to excimer decreased, suggesting that interchain interactions are suppressed. By measuring temperature dependent conductivity, we also found that the activation energy for hole conductivity is smaller in PTQ1:PS blends than in PTQ1 neat films. These findings suggest that trap sites decrease because of the suppressed interaction between PTQ1 chains in blend films. We also measured conductive atomic force microscope images of the blend films to clarify the local conductive property. For PTQ1 neat films, a low conductive image was observed over the entire film. For PTQ1:PS blends, on the other hand, many highly conductive spots were locally found. We thus conclude that the dilution of PTQ1 chains in the PS matrix leads to less formation of trap sites, resulting in more conductive transport in PTQ1:PS blends than in PTQ1 neat films.

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Enhanced Hole Transport in Ternary Blend Polymer Solar Cells

et al. 2019

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Recently, ternary blend polymer solar cells have attracted great attention to improve a short-circuit current density (J SC ) effectively, because complementary absorption bands can harvest the solar light over a wide wavelength range from visible to near-IR region. Interestingly, some ternary blend solar cells have shown improvements not only in J SC but also in fill factor (FF). Previously, we also reported that a ternary blend solar cell based on a low-bandgap polymer (PTB7-Th), a widebandgap polymer (PDCBT), and a fullerene derivative (PCBM) exhibited a higher FF than their binary analogues. Herein, we study charge transport in PTB7-Th/PDCBT/PCBM ternary blend films to address the origin of the improvement in FF. We found that hole polarons are located in PTB7-Th domains and their mobility is enhanced in the ternary blend film.

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Ternary Blend Polymer Solar Cells Based on Wide-bandgap Polymer PDCBT and Low-bandgap Polymer PTB7-Th

Cited by 8 publications

References 21 publications

Employing PCBTDPP as an Efficient Donor Polymer for High Performance Ternary Polymer Solar Cells

Employing PCBTDPP as an Efficient Donor Polymer for High Performance Ternary Polymer Solar Cells

Enhanced Charge Transport in a Conjugated Polymer Blended with an Insulating Polymer

Enhanced Hole Transport in Ternary Blend Polymer Solar Cells

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