Ternary Organic Solar Cells with Efficiency &gt;16.5% Based on Two Compatible Nonfullerene Acceptors

Song, Jinsheng; Li, Chao; Zhu, Lei; Guo, Jing; Xu, Jinqiu; Zhang, Xuning; Weng, Kangkang; Zhang, Kangning; Min, Jie; Xin, Hao; Zhang, Yuan; Liu, Feng; Sun, Yanming

doi:10.1002/adma.201905645

Cited by 254 publications

(192 citation statements)

References 62 publications

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“…During the past five years, polymer solar cells (PSCs) based on narrow bandgap (NBG) fused‐ring small molecule (SM) acceptors have made considerable progress, among which the state‐of‐the‐art PSCs have achieved power conversion efficiencies (PCEs) of 16–18% . Regarding such SM acceptor‐based PSCs, the all‐polymer solar cells (all‐PSCs) consisting of a polymer donor and a polymer acceptor show unique advantages in the flexible large‐scale and wearable energy generators due to their excellent morphology stability and mechanical robustness .…”

Section: Methodsmentioning

confidence: 99%

10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

Fan

Liu

et al. 2020

Solar RRL

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During the past five years, polymer solar cells (PSCs) based on narrow bandgap (NBG) fused-ring small molecule (SM) acceptors have made considerable progress, [1][2][3][4] among which the state-of-the-art PSCs have achieved power conversion efficiencies (PCEs) of 16-18%. [5][6][7][8][9][10][11][12][13][14][15][16][17] Regarding such SM acceptor-based PSCs, the all-polymer solar cells (all-PSCs) consisting of a polymer donor and a polymer acceptor show unique advantages in the flexible large-scale and wearable energy generators due to their excellent morphology stability and mechanical robustness. [18][19][20][21] However, most of the efficient all-PSCs have PCEs ranging in 8-10%, [22][23][24][25][26][27][28][29][30][31][32][33][34] although a few of them achieved PCEs over 11%, [35][36][37] which is still far behind that of the efficient PSCs based on SM acceptors due to the lack of high-performance polymer acceptors. To date, polymer acceptors have been mainly confined into a small number of structural building blocks, [24][25][26][38][39][40] and the most widely studied one is the polymer N2200 with a donor-acceptor (D-A) backbone of naphthalene diimide (NDI)-alt-bithiophene due to its NBG and suitable molecular energy levels. [39][40][41][42][43] However, N2200 neat film suffers from a low absorption coefficient of %0.3 Â 10 5 cm À1 and an excess strong crystallinity and stacking, which usually lead to the limited photocurrent and large phase separation in active layers. [39][40][41][42][43] The limited light absorption capacity for most polymer acceptors hinders the improvement of the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs). Herein, by simultaneously increasing the conjugation of the acceptor unit and enhancing the electron-donating ability of the donor unit, a novel narrowbandgap polymer acceptor PF3-DTCO based on an A-D-A-structured acceptor unit ITIC16 and a carbon-oxygen (C-O)-bridged donor unit DTCO is developed. The extended conjugation of the acceptor units from IDIC16 to ITIC16 results in a red-shifted absorption spectrum and improved absorption coefficient without significant reduction of the lowest unoccupied molecular orbital energy level. Moreover, in addition to further broadening the absorption spectrum by the enhanced intramolecular charge transfer effect, the introduction of C-O bridges into the donor unit improves the absorption coefficient and electron mobility, as well as optimizes the morphology and molecular order of active layers. As a result, the PF3-DTCO achieves a higher PCE of 10.13% with a higher short-circuit current density ( J sc ) of 15.75 mA cm À2 in all-PSCs compared with its original polymer acceptor PF2-DTC (PCE ¼ 8.95% and J sc ¼ 13.82 mA cm À2 ). Herein, a promising method is provided to construct high-performance polymer acceptors with excellent optical absorption for efficient all-PSCs.

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Section: Methodsmentioning

confidence: 99%

10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

Fan

Liu

et al. 2020

Solar RRL

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“…Non‐fullerene small‐molecule acceptors (SMAs) have been taken as the mainstream of researches for their great potential of reaching high power conversion efficiencies (PCEs) and stabilities. [ 7–12 ] Currently, the PCEs of the state‐of‐the‐art non‐fullerene SMA based PSCs have already surpassed 16% derived from the PM6: Y6 system reported by Zou et al [ 13–20 ]…”

Section: Introductionmentioning

confidence: 99%

Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

Guo

et al. 2020

Adv Funct Materials

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The prosperous period of polymer solar cells (PSCs) has witnessed great progress in molecule design methods to promote power conversion efficiency (PCE). Designing asymmetric structures has been proved effective in tuning energy level and morphology, which has drawn strong attention from the PSC community. Two hepta-ring and octa-ring asymmetric small molecular acceptors (SMAs) (IDTP-4F and IDTTP-4F) with S-shape and C-shape confirmations are developed to study the relationship between conformation shapes and PSC efficiencies. The similarity of absorption and energy levels between two SMAs makes the conformation a single variable. Additionally, three wide-bandgap polymer donors (PM6, S1, and PM7) are chosen to prove the universality of the relationship between conformation and photovoltaic performance. Consequently, the champion PCE afforded by PM7: IDTP-4F is as high as 15.2% while that of PM7: IDTTP-4F is 13.8%. Moreover, the S-shape IDTP-4F performs obviously better than their IDTTP-4F counterparts in PSCs regardless of the polymer donors, which confirms that S-shape conformation performs better than the C-shape one. This work provides an insight into how conformations of asymmetric SMAs affect PCEs, specific functions of utilizing different polymer donors to finely tune the active-layer morphology and another possibility to reach an excellent PCE over 15%.

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“…For further improving the PCE of Y6‐based OSCs, [ 4–7 ] many efforts have been made, such as chemical modification of the Y6, [ 8–11 ] morphological optimization of the active layer, [ 12 ] and introduction of a third component. [ 13–19 ] Besides, interfacial engineering is also a useful strategy to boost the device performance. [ 20–24 ] Noted that most of OSCs based on PM6:Y6 system with high performances adopt poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as hole transport layer (HTL) due to its good film‐forming property, high transparency in the visible region, and solution processability.…”

Section: Introductionmentioning

confidence: 99%

Boosting Performance of Non‐Fullerene Organic Solar Cells by 2D g‐C₃N₄ Doped PEDOT:PSS

Yang

et al. 2020

Adv Funct Materials

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The power-conversion efficiency (PCE) of single-junction organic solar cells (OSCs) has exceeded 16% thanks to the development of non-fullerene acceptor materials and morphological optimization of active layer. In addition, interfacial engineering always plays a crucial role in further improving the performance of OSCs based on a well-established active-layer system. Doping of graphitic carbon nitride (g-C 3 N 4 ) into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as a hole transport layer (HTL) for PM6:Y6-based OSCs is reported, boosting the PCE to almost 16.4%. After being added into the PEDOT:PSS, the g-C 3 N 4 as a Bronsted base can be protonated, weakening the shield effect of insulating PSS on conductive PEDOT, which enables exposures of more PEDOT chains on the surface of PEDOT:PSS core-shell structure, and thus increasing the conductivity. Therefore, at the interface between g-C 3 N 4 doped HTL and PM6:Y6 layer, the charge transport is improved and the charge recombination is suppressed, leading to the increases of fill factor and short-circuit current density of devices. This work demonstrates that doping g-C 3 N 4 into PEDOT:PSS is an efficient strategy to increase the conductivity of HTL, resulting in higher OSC performance.

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Ternary Organic Solar Cells with Efficiency >16.5% Based on Two Compatible Nonfullerene Acceptors

Cited by 254 publications

References 62 publications

10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

Boosting Performance of Non‐Fullerene Organic Solar Cells by 2D g‐C₃N₄ Doped PEDOT:PSS

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Ternary Organic Solar Cells with Efficiency >16.5% Based on Two Compatible Nonfullerene Acceptors

Cited by 254 publications

References 62 publications

10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

Boosting Performance of Non‐Fullerene Organic Solar Cells by 2D g‐C3N4 Doped PEDOT:PSS

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Boosting Performance of Non‐Fullerene Organic Solar Cells by 2D g‐C₃N₄ Doped PEDOT:PSS