Molecular packing control enables excellent performance and mechanical property of blade-cast all-polymer solar cells

Lin, Baojun; Zhang, Lin; Zhao, Heng; Xu, Xianbin; Zhou, Ke; Zhang, Song; Gou, Lu; Fan, Baobing; Zhang, Lei; Yan, Hongping; Gu, Xiandan; Ying, Lei; Huang, Fei; Cao, Yong; Ma, Wei

doi:10.1016/j.nanoen.2019.02.046

Cited by 52 publications

(43 citation statements)

References 62 publications

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“…[ 36–39 ] Here, K is the Boltzmann constant, q is the elementary charge, and T is the absolute temperature. If the β value is close to 1, indicating the negligible trap‐assisted recombination in active layers, [ 40,41 ] the β of 1.183 for the optimal ternary OPVs is close to 1, compared with that of 1.342 for the BTP‐BO‐4F‐based binary OPVs and 1.281 for the Y6‐1O‐based binary OPVs, suggesting that trap‐assisted recombination can be efficiently restrained in the optimal ternary OPVs. The bimolecular recombination can be evaluated by the parameter α , if α is very close to 1, suggesting that bimolecular recombination could be negligible.…”

Section: Resultsmentioning

confidence: 99%

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

et al. 2021

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Efficient organic photovoltaic cells (OPVs) are fabricated using two structurally similar Y6 derivations (BTP‐BO‐4F and Y6‐1O) as acceptor and PM6 as donor. The two binary OPVs exhibit a high fill factor (FF) (>76%), the complementary short‐circuit‐current density (JSC) and open‐circuit voltage (VOC). The high FFs of binary OPVs indicate the good compatibility of corresponding materials to form efficient charge transport channels. A power conversion efficiency (PCE) of 17.59% is obtained from ternary OPVs with 15 wt% Y6‐1O in acceptors, benefiting from the simultaneously improved JSC of 26.13 mA cm−2, a VOC of 0.860 V, and an FF of 78.26%. The values of VOC of ternary OPVs can be gradually increased along with the incorporation of Y6‐1O, suggesting the preferred formation of an alloyed state between BTP‐BO‐4F and Y6‐1O due to their good compatibility. Meanwhile, the cascaded energy levels of BTP‐BO‐4F and Y6‐1O can form efficient electron transport channels in ternary active layers. The main contribution of Y6‐1O can be summarized as enhancing photon harvesting, optimizing phase separation, and adjusting molecular arrangement. The experimental results may provide new insight on developing efficient ternary OPVs by selecting two well‐compatible acceptors.

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Section: Resultsmentioning

confidence: 99%

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

et al. 2021

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“…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 . However, most of the efficient all‐PSCs have PCEs ranging in 8–10%, although a few of them achieved PCEs over 11%, 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, 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 .…”

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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“…So far, only few low band gap (LBG) polymer acceptors have achieved PCEs higher than 8 % in their all‐PSCs, [16–25] which are typically based on imide‐functionalized arenes [15–23, 26–28] or B→N‐bridged bipyridine building blocks [24, 25] . For example, as the most widely used LBG polymer acceptor, naphthalene diimide‐based N2200 has achieved a PCE over 8 % by using absorption complementary polymer donors from different groups [29–34] . However, the low absorption coefficient of N2200 film (<0.3×10 5 cm −1 ) limits its short‐circuit current density ( J sc ) and PCE in all‐PSCs.…”

Section: Methodsmentioning

confidence: 99%

A Non‐Conjugated Polymer Acceptor for Efficient and Thermally Stable All‐Polymer Solar Cells

Fan

Chen

et al. 2020

Angewandte Chemie

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A non-conjugated polymer acceptor PF1-TS4 was firstly synthesized by embedding a thioalkyl segment in the mainchain, which shows excellent photophysical properties on par with a fully conjugated polymer, with a low optical band gap of 1.58 eV and a high absorption coefficient > 10 5 cm À1 , a high LUMO level of À3.89 eV, and suitable crystallinity. Matched with the polymer donor PM6, the PF1-TS4-based all-PSC achieved a power conversion efficiency (PCE) of 8.63 %, which is % 45 % higher than that of a device based on the small molecule acceptor counterpart IDIC16. Moreover, the PF1-TS4-based all-PSC has good thermal stability with % 70 % of its initial PCE retained after being stored at 85 8C for 180 h, while the IDIC16-based device only retained % 50 % of its initial PCE when stored at 85 8C for only 18 h. Our work provides a new strategy to develop efficient polymer acceptor materials by linkage of conjugated units with non-conjugated thioalkyl segments.

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Molecular packing control enables excellent performance and mechanical property of blade-cast all-polymer solar cells

Cited by 52 publications

References 62 publications

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

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

A Non‐Conjugated Polymer Acceptor for Efficient and Thermally Stable All‐Polymer Solar Cells

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