Simple organic donors based on halogenated oligothiophenes for all small molecule solar cells with efficiency over 11%

Duan, Tainan; Gao, Jie; Xu, Tongle; Kan, Zhipeng; Chen, Wenjing; Singh, Ranbir; Kini, Gururaj P.; Zhong, Cheng; Yu, Daquan; Xiao, Zhengguo; Xiao, Zeyun; Lu, Shirong

doi:10.1039/d0ta00159g

Cited by 45 publications

(29 citation statements)

References 29 publications

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“…Furthermore, the molar extinction coefficients (ε) of the polymers also increased in the order of 4.7 × 10 4 > 5.4 × 10 4 > 5.7 × 10 4 M −1 cm −1 , respectively, for P1, P2, and P3, thereby emphasizing that insertion of F atoms aids in the enhancement of ε via the high coplanarity and improved interchain ordering in the backbone of the fluorinated polymer. [ 48,58 ] The optical bandgaps ( E g opt ), which were calculated from the respective absorption onset values (λ onset ) using the equation E g opt = 1240/λ onset , were 2.13 (P1), 1.96 (P2), and 2.00 eV (P3).…”

Section: Resultsmentioning

confidence: 99%

Understanding the Critical Role of Sequential Fluorination of Phenylene Units on the Properties of Dicarboxylate Bithiophene‐Based Wide‐Bandgap Polymer Donors for Non‐Fullerene Organic Solar Cells

Kini

Lee

Jeon

et al. 2021

Macromol. Rapid Commun.

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Design and development of wide bandgap (WBG) polymer donors with low‐lying highest occupied molecular orbitals (HOMOs) are increasingly gaining attention in non‐fullerene organic photovoltaics since such donors can synergistically enhance power conversion efficiency (PCE) by simultaneously minimizing photon energy loss (Eloss) and enhancing the spectral response. In this contribution, three new WBG polymer donors, P1, P2, and P3, are prepared by adding phenylene cores with a different number of fluorine (F) substituents (n = 0, 2, and 4, respectively) to dicarboxylate bithiophene‐based acceptor units. As predicted, fluorination effectively aides in the lowering of HOMO energy levels, tailoring of the coplanarity and molecular ordering in the polymers. Thus, fluorinated P2 and P3 polymers show higher coplanarity and more intense interchain aggregation than P1, leading to higher charge carrier mobilities and superior phase‐separated morphology in the optimized blend films with IT‐4F. As a result, both P2:IT‐4F and P3:IT‐4F realize the best PCEs of 6.89% and 7.03% (vs 0.16% for P1:IT‐4F) with lower Eloss values of 0.65 and 0.55 eV, respectively. These results signify the importance of using phenylene units with sequential fluorination in polymer backbone for modifying the optoelectronic properties and realizing low Eloss values by synergistically lowering the HOMO energy levels.

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Section: Resultsmentioning

confidence: 99%

Understanding the Critical Role of Sequential Fluorination of Phenylene Units on the Properties of Dicarboxylate Bithiophene‐Based Wide‐Bandgap Polymer Donors for Non‐Fullerene Organic Solar Cells

Kini

Lee

Jeon

et al. 2021

Macromol. Rapid Commun.

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“…DRCN7T, 2F7T, and 2Cl7T have similar structures except the central core units which are thiophene, 3,4‐difluorothiophene, and 3,4‐dichlorothiophene, respectively 49 . Compared with the nonhalogenated counterpart DRCN7T, both 2F7T and 2Cl7T show slightly blue‐shifted absorptions and thus larger E g s, and deeper HOMO levels.…”

Section: Smds Based On Oligothiophene Unitsmentioning

confidence: 99%

Section: Smds Based On Oligothiophene Unitsmentioning

confidence: 99%

Recent progress on all‐small molecule organic solar cells using small‐molecule nonfullerene acceptors

Kan

Zuo

et al. 2020

InfoMat

132

100

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Recently, solution‐processed organic solar cells combining small‐molecule donor and nonfullerene acceptor have achieved breakthrough results with the certified efficiency over 15%. These impressive progresses are driven by the concerted efforts of modifying the donor and acceptor materials and optimizing the morphology. Considering the defined chemical structures and easily tuned properties of small‐molecule materials, it is of great necessity and importance to pay more attentions on the topic of all‐small molecule organic solar cells. Here, we summarize the recent progress of all‐small molecule organic solar cells from the prospect of materials' evolutions and expect to provide some hints for its future developments. The involved small‐molecule donors including oligothiophene‐, benzodithiophene‐, naphthodithiophene‐, and porphyrin‐based materials are discussed to illustrate the relationship of chemical structures, properties, and device performance. Then, the small‐molecule nonfullerene acceptors in all‐small molecules organic solar cells are discussed to highlight their vital role. Finally, we will present the challenges and future of this research area.

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“…[1][2][3][4][5][6][7][8][9] Several devices have evolved through the use of these materials, such as field-effect transistors (FETs) for microelectronics, 10,11 light-emitting diodes (LEDs) for lighting and displays, [12][13][14][15] sensors, [16][17][18] lasers, [19][20][21] molecular switches [22][23][24] and photovoltaics. [25][26][27][28][29][30][31] Despite the tremendous achievements in recent years that have led to the commercialisation of these devices, significant efforts are still devoted to enhance their performance, improve their processability and stability and understand their functionality. Hence, it is of great interest to investigate different or novel molecular systems to allow the discovery of crucial structure-activity relationships that will allow the development of newer materials with enhanced processability and performance.…”

Section: Introductionmentioning

confidence: 99%

New thiophene-based conjugated macrocycles for optoelectronic applications

et al. 2021

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Simple organic donors based on halogenated oligothiophenes for all small molecule solar cells with efficiency over 11%

Abstract: A set of centrally halogenated oligothiophenes were developed for organic solar cells. The devices with a chlorinated donor (2Cl7T) achieved power conversion efficiencies (PCEs) of up to ca. 11.5% (vs. ca. 2.5% for non-halogenated donor DRCN7T).

Cited by 45 publications

References 29 publications

Understanding the Critical Role of Sequential Fluorination of Phenylene Units on the Properties of Dicarboxylate Bithiophene‐Based Wide‐Bandgap Polymer Donors for Non‐Fullerene Organic Solar Cells

Understanding the Critical Role of Sequential Fluorination of Phenylene Units on the Properties of Dicarboxylate Bithiophene‐Based Wide‐Bandgap Polymer Donors for Non‐Fullerene Organic Solar Cells

Recent progress on all‐small molecule organic solar cells using small‐molecule nonfullerene acceptors

New thiophene-based conjugated macrocycles for optoelectronic applications

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