Organic Solar Cells Based on Ternary Blend Active Layer of Two Donors PTB7, P3HT and Accepter PC61BM

Ohori, Yurina; Hoashi, Toshihiro; Yanagi, Yousuke; Okukawa, Takanori; Fujii, Shunjiro; Kataura, Hiromichi; Nishioka, Yasushiro

doi:10.2494/photopolymer.27.569

Cited by 7 publications

(6 citation statements)

References 30 publications

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“…Thus, the obtained

{normalE}_{normalg}^{ec}

of P2 and P3 are 2.05 eV and 2.02 eV, which is also almost in good agreement with their optical bandgap. Compared with the HOMO level of P3HT (−5.0 eV), the HOMO levels of the three polymers were lower. The open circuit voltage (V oc ) is proportional to the energy difference between the HOMO level of a polymer donor and the LUMO level of an acceptor .…”

Section: Resultsmentioning

confidence: 73%

Dithieno[2,3‐d:2′,3′‐d′]naphtho[2,1‐b:3,4‐b′]dithiophene based medium bandgap conjugated polymers for photovoltaic applications

Yang

et al. 2016

J of Applied Polymer Sci

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Three novel medium band gap (MBG) conjugated polymers (CPs) (named as P1, P2, and P3, respectively) were developed by copolymerizing 2,7-dibromo-10,11-di(2-hexyldecyloxy)dithieno[2,3-d:2 0 ,3 0 -d 0 ]naphtho[2,1-b:3,4-b 0 ]dithiophene (NDT-Br) with three different units: 2,5-bis(tributylstannyl)thiophene, 2,5-bis(trimethylstannyl)thieno[3,2-b]thiophene and trans21,2-bis(tributylstannyl)ethene, respectively. The thermal, optical, and electrochemical properties of the polymers were investigated. All of the polymers have good thermal stability and medium band gap ( 1.9 eV). Prototype bulk heterojunction photovoltaic cells based on the blend P1/P2/P3 and [6,6] phenyl-C61 butyric acid methyl ester (PC 61 BM) were assembled and the photovoltaic properties were assessed. Power conversion efficiencies (PCEs) of 1.61% 2.43% have been obtained under 100 mW cm 22 illumination (AM1.5).

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“…Thus, the obtained

{normalE}_{normalg}^{ec}

Section: Resultsmentioning

confidence: 73%

Dithieno[2,3‐d:2′,3′‐d′]naphtho[2,1‐b:3,4‐b′]dithiophene based medium bandgap conjugated polymers for photovoltaic applications

Yang

et al. 2016

J of Applied Polymer Sci

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“…It is worth mentioning that the absorption peak range of the PTB7/P3HT blended film was extremely wide (from 350 to 750 nm) when the P3HT content was 30%, which is conducive to the capture of photons via solar cells. 28 As shown in Figure S3, the absorption intensity of the P3HT characteristic peak became stronger and more dominant in the normalized UV− vis absorption spectra with a further increase in the P3HT content (>30%). Moreover, the absorption peaks of the blended films at 580−620 nm were affected by both P3HT and PTB7.…”

Section: Methodsmentioning

confidence: 81%

“…Therefore, ratio R can be used to intuitively reflect the increase trend of PTB7 molecular chain orderness. It is worth mentioning that the absorption peak range of the PTB7/P3HT blended film was extremely wide (from 350 to 750 nm) when the P3HT content was 30%, which is conducive to the capture of photons via solar cells . As shown in Figure S3, the absorption intensity of the P3HT characteristic peak became stronger and more dominant in the normalized UV–vis absorption spectra with a further increase in the P3HT content (>30%).…”

Section: Resultsmentioning

confidence: 95%

Effect of an External Electric Field on the Ordered Structures of Blended Donor Polymers in Solar Cells

Ren

Gao

2022

J. Phys. Chem. C

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This research investigated the effect of a high external electric field (EEF) on the ordered structure of a blended film composed of poly(3-hexylthiophene) (P3HT) and poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]-dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]-thieno[3,4-b]thiophenediyl]] (PTB7) through atomic force microscopy, high-resolution transmission electron microscopy, micro-Raman spectroscopy, ultraviolet–visible absorption spectroscopy, photoluminescence spectroscopy, and space-charge-limited current measurements. With the application of an optimal electric field, the orderness of the PTB7/P3HT blended film was improved, and its hole mobility was evidently enhanced from 2.72 × 10–3 to 6.76 × 10–3 cm2 V–1 s–1. PTB7 and P3HT formed an interpenetrating structure in the precursor solution. P3HT oriented along the electric field direction and drove PTB7 molecular chains to move in a manner that enabled the PTB7 molecular chain segment that was originally unaffected by the EEF to overcome steric hindrance and twist to achieve tight π–π stacking, forming more ordered structures in the PTB7/P3HT blended film. The ordered structure of PTB7 in the blended film was described by an order parameter R = A 0–0/A 0–1 in the UV–vis absorption spectra. This parameter R increased from 1.01 to 1.12 after the addition of 30% P3HT and further increased to 1.14 under the effect of the EEF, indicating that the order degree of PTB7 molecular chains continued to increase in the PTB7/P3HT blended film. This research contributes to the understanding of the effect of the EEF on the ordered structures of PTB7/P3HT blended films. It reveals the formation mechanism and regularity of the ordered structures of two donor polymers, enabling the fabrication of ternary solar cells with high efficiency on the basis of polymer physics.

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“…A solution-processed bulk heterojunction BHJSC is the most fruitful device architecture for organic based SC. Power conversion efficiencies PCEs in organic based SCs are highly enhanced up to 3-8% for the bulk heterojunction solar cells (BHJSCs) [6][7][8]. Record values of PCE up to 12% have been also reached [9].…”

Section: Introductionmentioning

confidence: 99%

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

Zahran

Mossad

Elhalawany³

2019

Egypt. J. Chem.

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P OLYTHIOPHENE/SILVER (PT/Ag) nanocomposite has been synthesized and characterized.Morphological studies have been made to elucidate the structure of the formed nanocomposite. The morphological studies revealed that the formed nancomposite is highly dendritic forming tree like structure. A bulk heterojunction solar cell (BHJSC) has been built using the prepared nanocomposite as photo active layer. The solar cell parameters such as open circuit voltage Voc, short circuit current Isc and fill factor FF have been determined via current-voltage I-V characteristic. The maximum power conversion efficiency (PCE) obtained from I-V characteristic was 14.2 % which is much higher than that obtained from other commercial polythiophene based solar cells (SC). The enhanced PCE was attributed to the superior highly dendritic structure of the formed nanocomposite which provides charge transfer (CT) pathways and facilitates separation of the formed excitons into free electrons and holes. As far as we know none of these characteristics have been reached before in the open literature for PT based solar cells.

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Organic Solar Cells Based on Ternary Blend Active Layer of Two Donors PTB7, P3HT and Accepter PC61BM

Cited by 7 publications

References 30 publications

Dithieno[2,3‐d:2′,3′‐d′]naphtho[2,1‐b:3,4‐b′]dithiophene based medium bandgap conjugated polymers for photovoltaic applications

Dithieno[2,3‐d:2′,3′‐d′]naphtho[2,1‐b:3,4‐b′]dithiophene based medium bandgap conjugated polymers for photovoltaic applications

Effect of an External Electric Field on the Ordered Structures of Blended Donor Polymers in Solar Cells

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

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