Efficient Cathode Interfacial Materials Based on Triazine/Phosphine Oxide for Conventional and Inverted Organic Solar Cells

Aryal, Um Kanta; Reddy, Saripally Sudhaker; Choi, Jung-Min; Woo, Chae Young; Jang, Seokhoon; Lee, Youngu; Kim, Bong Soo; Lee, Hyung Woo; Jin, Sung Ho

doi:10.1007/s13233-020-8086-0

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…The results of some recent studies encompass the synthesis and design of novel semiconducting materials with fine-tuned electronic energy levels and optimization of the film surface of active materials that predominantly rely on the solubility, 3 miscibility, 3 and crystallinity 4 of the constituent molecules. To ease carrier extraction and improve the device performance, interlayers have been also applied to the cathode 5,6 and anode. 7 However, morphological compatibility of new and existing materials along with the processability of multiple layers must be further considered.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dissociation of excitons and charge transfer in organic solar cells of polymer:fullerene blends with molecular BPFZn doping

Meresa

Parida

Long

et al. 2022

Intl J of Energy Research

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We introduce bis(pentafluorophenyl)zinc (BPFZn) as a molecular dopant in an organic solar cell (OSC) system based on polymer:fullerene blends to improve the efficiency of exciton dissociation and balance charge-carrier mobilities. We employ PC 71 BM as an acceptor along with PTB7-Th as a donor to form bulk heterojunctions. The maximum power conversion efficiency increases from 7.7% without doping to 8.7% upon BPFZn doping at a concentration of 0.01 wt %. The fill factor, which is increased from 50.7% to 57.8%, is the main device parameter of enhancement. An optimal concentration of BPFZn promotes splitting of exciton and suppresses charge recombination in the PTB7-Th:PC 71 BM OSCs. Additionally, balanced carrier mobilities are observed in the moderately doped blends.

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Section: Introductionmentioning

confidence: 99%

Enhanced dissociation of excitons and charge transfer in organic solar cells of polymer:fullerene blends with molecular BPFZn doping

Meresa

Parida

Long

et al. 2022

Intl J of Energy Research

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“…Solution‐processed polymer solar cells (PSCs) using a bulk heterojunction (BHJ) have attracted attention because of their unique advantages such as lightweight, flexibility, semitransparency, roll‐to‐roll processing, and low cost. [ 1–5 ] In recent years, significant efforts have been devoted to the development of novel materials, device optimization, and morphology control to achieve enhanced power conversion efficiencies (PCEs) over 18% in single‐junction PSCs. [ 6,7 ] However, for the scaling‐up to industrial production, a series of prerequisites such as long‐term stability, good thickness tolerance, and high‐efficiency of the PSCs processed with nonhalogenated solvent systems still need to be realized.…”

Section: Introductionmentioning

confidence: 99%

Unprecedented Long‐Term Thermal Stability of 1D/2A Terpolymer‐Based Polymer Solar Cells Processed with Nonhalogenated Solvent

Jung

Kim

et al. 2021

Solar RRL

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Donor–acceptor (D–A) copolymer‐based polymer solar cells (PSCs) processed with nonhalogenated solvents exhibit relatively low power conversion efficiencies (PCE) due to undesirable morphological properties, including high aggregation and unfavorable orientation. Moreover, they show very poor long‐term stability owing to excessive molecular aggregation and unfavorable phase separation. Thus, novel p‐type polymers are required for high‐efficiency and long‐lived PSCs that can be processed in ecofriendly nonhalogenated solvents. Herein, a novel series of 1D/2A terpolymers (PBTPBD) composed of 4,8‐bis(5‐(2‐ethylhexyl)‐4‐fluorothiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene (BDT‐F), 1,3‐bis(thiophen‐2‐yl)‐5,7‐bis(2‐ethylhexyl)benzo‐[1,2‐c:4,5‐c′]dithiophene‐4,8‐dione (BDD), and 1,3‐bis‐(4‐hexylthiophen‐2‐yl)‐5‐octyl‐4H‐thieno[3,4‐c]pyrrole‐4,6(5H)‐dione (HT‐TPD) is synthesized and characterized for high‐efficiency and long‐lived PSCs. A PBTPBD‐50:IT‐4F blended film exhibits a favorable face‐on orientation and superior hole and electron mobility. Therefore, the corresponding PBTPBD‐50:IT‐4F PSC, processed with a nonhalogenated solvent, exhibits a high PCE of 13.64%, which is 13% higher than that of the related nonhalogenated solvent‐processed PSCs. Furthermore, the PBTPBD‐50:IT‐4F PSC maintains 82% of the initial PCE even after 204 days at 85 °C, which is the highest thermal stability achieved among PSCs processed with nonhalogenated solvents. The high‐efficiency and superior long‐term thermal stability of the PBTPBD‐50:IT‐4F PSC are attributed to the excellent miscibility of PBTPBD‐50 and IT‐4F and the suppression of the morphological changes in the photoactive layer.

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Side‐chain engineering of regioregular copolymers for high‐performance polymer solar cells processed with nonhalogenated solvents

Jung

Kim

et al. 2022

Bulletin Korean Chem Soc

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Conjugated polymers for bulk heterojunction polymer solar cells (BHJ PSCs) should be processed with nonhalogenated solvents because of environmental concerns. Here, we report novel regioregular copolymers for high-performance PSCs processed with nonhalogenated solvents. The regioregular copolymers (i.e., rr-PfBT2f4T-2OD and rr-PfBT2f4T-2DT) consist of 3 00 ,4 0 -difluoro-2,2 0 :5 0 ,2 00 :5 00 ,2 000 -quaterthiophene (2f4T) with different side chains (2-octadodecyl (OD) and 2-decyltetradecyl (DT)) and 5-fluorobenzo[c][1,2,5]thiadiazole (fBT). The regioregular copolymers with controlled fBT orientation show high solubility in nonhalogenated solvents. Both regioregular copolymers possess suitable energy levels, leading to sufficient energy offsets with a nonfullerene acceptor, BTP-eC11. An rr-PfBT2f4T-2DT:BTP-eC11-blended film exhibited predominant face-on orientation compared to the rr-PfBT2f4T-2OD:BTP-eC11-blended film. In addition, the rr-PfBT2f4T-2DT:BTP-eC11-blended film showed much more balanced hole/electron mobility (μ h /μ e $ 4.73) than rr-PfBT2f4T-2OD: BTP-eC11-blended film (μ h /μ e $ 45.86). Therefore, rr-PfBT2f4T-2DT:BTP-eC11-based PSCs, processed with 1,2,4-trimethylbenzene, showed a power conversion efficiency of 13.21% which is 60% higher than rr-PfBT2f4T-2OD: BTP-eC11-based PSCs.

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Efficient Cathode Interfacial Materials Based on Triazine/Phosphine Oxide for Conventional and Inverted Organic Solar Cells

Cited by 5 publications

References 43 publications

Enhanced dissociation of excitons and charge transfer in organic solar cells of polymer:fullerene blends with molecular BPFZn doping

Enhanced dissociation of excitons and charge transfer in organic solar cells of polymer:fullerene blends with molecular BPFZn doping

Unprecedented Long‐Term Thermal Stability of 1D/2A Terpolymer‐Based Polymer Solar Cells Processed with Nonhalogenated Solvent

Side‐chain engineering of regioregular copolymers for high‐performance polymer solar cells processed with nonhalogenated solvents

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