High absorption coefficient π-conjugation-extended donor-acceptor copolymers for ternary-blend solar cells

Hwang, Hyeongjin; Park, Chaneui; Sin, Dong Hun; Song, Eunjoo; Cho, Kilwon

doi:10.1016/j.orgel.2020.105738

Cited by 21 publications

(37 citation statements)

References 40 publications

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“…Here, we extended the side group and backbone of a push–pull CP based on benzodithiophene and thienopyrroledione units (donor CP, PBT-OTT; side-group extension CP, PBTBT-OTT; and backbone-extension CP, PDTBT-OTT) and fabricated ternary-blend OSCs with [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM, the main acceptor) and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC, the third component) (Figure ). , The photovoltaic parameters of our OSCs are summarized in Figure S1 and Table S1 in the Supporting Information. Particularly, we elucidated the donor CP extension effects on the hole-transfer dynamics from ITIC to the CPs and the charge-generation mechanism within the ternary-blend NFA OSCs by transient absorption (TA) spectroscopy.…”

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Charge Recycling Mechanism Through a Triplet Charge-Transfer State in Ternary-Blend Organic Solar Cells Containing a Nonfullerene Acceptor

et al. 2021

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We investigated the side-group and backbone-extension effects of a push−pull conjugated polymer (CP) on the charge-generation mechanism in ternary-blend organic solar cells (OSCs) containing PC 71 BM and a nonfullerene acceptor (NFA, ITIC). Transient absorption spectroscopy results revealed that the CP extension increased the hole-transfer efficiency from ITIC to the CPs, inducing the formation of triplet (T 1 ) excitons by nongeminate recombination (via triplet charge-transfer states, 3 CT) because of the finely mixed morphologies. Particularly, the 3 CT state relaxation to T 1 excitons was efficiently suppressed by PC 71 BM in the ternary-blend films based on the side-group and backbone extended CPs. This caused the recycling of the free carriers generated by the hole transfer from ITIC to the CPs, thereby increasing the efficiency of the OSC having the optimized ternaryblend morphology. Our findings provide new insights on the mechanism of charge generation through the photoinduced hole transfer from NFAs to CPs.

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Charge Recycling Mechanism Through a Triplet Charge-Transfer State in Ternary-Blend Organic Solar Cells Containing a Nonfullerene Acceptor

et al. 2021

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“…Due to the highly adjustable optical bandgaps, NFAs usually can significantly enhance the optical absorption of OPVs based on FA, providing an effective way to improve device performance. [114][115][116][117][118] Tan et al 90 adopted the advisable approach to construct the absorption spectrum-complementary PBDTBDD: PC 60 10.36% vs. 6.63%) and J sc (17.76 vs. 10.99 mA cm À2 ) than the PBDTBDD: PC 60 BM binary OPV. The improved J sc was attributed to the additional absorption from ITIC.…”

Section: Incorporation Of Nfas Into Fullerene-based Binary Systems Enhancing Optical Absorptionmentioning

confidence: 99%

High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-fullerene Acceptors

Jiang

Zhu

2021

Organic Materials

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With the development of the non-fullerene acceptor (NFA), the use of ternary organic photovoltaic devices based on a fullerene acceptor and a NFA is now widespread, and the merits of both acceptor types can be fully utilized. However, the effective approach of enhancing device performance is adjusting the charge dynamics and the thin-film morphology of the active layer via introducing the second acceptor, which would significantly impact the open-circuit voltage, the short-circuit current, and the fill factor, thus strongly affecting device efficiency. The functions of the second acceptor in a ternary organic solar cell with a fullerene acceptor and a NFA are summarized here. These include a broader absorption spectrum; formation of a cascade energy level or energy transfer; modified thin-film morphology including phase separation, effects on crystallinity, size, and purity of domain; and vertical distribution along with improved charge dynamics like exciton dissociation and charge transport, collection, and recombination. Then, we discuss the hierarchical morphology in ternary solar cells may benefit device performance and the outlook of the ternary device.

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“…corporation of TPD with different electron-donating moieties resulted in p-type copolymers exhibiting PCE values ranging from 7% to 16%. [38][39][40][41][42][43] This review presents an outline of the synthesis of TPD-based conjugated polymers and their applications both as donor and acceptor materials in nonfullerene OSCs, reported in the past 5 years.…”

Section: Introductionmentioning

confidence: 99%

Thieno[3,4‐c]pyrrole‐4,6‐dione‐Based Conjugated Polymers for Nonfullerene Organic Solar Cells

Yaşa

Toppare

2022

Macro Chemistry & Physics

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Donor-acceptor (D-A) conjugated polymers have gotten significant attention in the past decades. Wide application area, ease of production, and cost-effectiveness have made the D-A conjugated polymers a pivotal class of organic electronics. Organic solar cells (OSCs) became one of the most critical application areas of conjugated polymers among many. Up to the last decade, intensive research has been conducted on fullerene-based OSCs. Drawbacks of fullerene derivatives like high cost, production obstacles, and difficulties in modifying molecular structure made the academia seek new alternatives. Emerging nonfullerene acceptors (NFAs) draw a new path for academia to tune OSCs' power conversion efficiency (PCE). With the ease of synthesis and purification, modification of molecular structure via various functional groups, NFAs start outperforming fullerene-based acceptors. Thieno[3,4-c]pyrrole-4,6-dione (TPD) is widely used in D-A conjugated polymers for high-performance OSCs. As a strong electron-withdrawing group, TPD provides deepened lowest unoccupied molecular orbital energy level and wide bandgaps when introduced into polymer backbones, enhancing optoelectronic properties photovoltaic performance. Herein, an overview of the applications of TPD-based donor and acceptor type conjugated polymers for nonfullerene and all-polymer solar cells in the last 5 years is provided.

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High absorption coefficient π-conjugation-extended donor-acceptor copolymers for ternary-blend solar cells

Cited by 21 publications

References 40 publications

Charge Recycling Mechanism Through a Triplet Charge-Transfer State in Ternary-Blend Organic Solar Cells Containing a Nonfullerene Acceptor

Charge Recycling Mechanism Through a Triplet Charge-Transfer State in Ternary-Blend Organic Solar Cells Containing a Nonfullerene Acceptor

High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-fullerene Acceptors

Thieno[3,4‐c]pyrrole‐4,6‐dione‐Based Conjugated Polymers for Nonfullerene Organic Solar Cells

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