Rationally Designed Donor–Acceptor Random Copolymers with Optimized Complementary Light Absorption for Highly Efficient All‐Polymer Solar Cells

Kim, Sang Woo; Choi, Joonhyeong; Bui, Thi Thu Trang; Lee, Changyeon; Cho, Changsoon; Na, Kwangmin; Jung, Jihye; Song, Chang Eun; Ma, Biwu; Lee, Jung‐Yong; Shin, Won Suk; Kim, Bumjoon J.

doi:10.1002/adfm.201703070

Cited by 37 publications

(35 citation statements)

References 70 publications

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“…Therefore, this feature might produce better‐matched (complementary) light harvesting in the blend film with the PBDTTTPD polymer donor (Figure S10, Supporting Information) and therefore the higher J SC value in the all‐PSC device. [5e,20] External quantum efficiency (EQE) curve also supports the red‐shifted trend of light absorption properties of acceptor polymers from 600 to 700 nm (Figure b). Next, we investigated the space‐charge‐limited current (SCLC) hole and electron mobilities ( µ h and µ e ) in the blend films.…”

Section: Resultssupporting

confidence: 62%

Shift of the Branching Point of the Side‐Chain in Naphthalenediimide (NDI)‐Based Polymer for Enhanced Electron Mobility and All‐Polymer Solar Cell Performance

You

Kim

Cho

et al. 2018

Adv Funct Materials

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The branching point of the side-chain of naphthalenediimide (NDI)-based conjugated polymers is systematically controlled by incorporating four different side-chains, i.e., 2-hexyloctyl (P(NDI1-T)), 3-hexylnonyl (P(NDI2-T)), 4-hexyldecyl (P(NDI3-T)), and 5-hexylundecyl (P(NDI4-T)). When the branching point is located farther away from the conjugated backbones, steric hindrance around the backbone is relaxed and the intermolecular interactions between the polymer chains become stronger, which promotes the formation of crystalline structures in thin film state. In particular, thermally annealed films of P(NDI3-T) and P(NDI4-T), which have branching points far away from the backbone, possess more-developed bimodal structure along both the face-on and edge-on orientations. Consequently, the field-effect electron mobilities of P(NDIm-T) polymers are monotonically increased from 0.03 cm 2 V −1 s −1 in P(NDI1-T) to 0.22 cm 2 V −1 s −1 in P(NDI4-T), accompanied by reduced activation energy and contact resistance of the thin films. In addition, when the series of P(NDIm-T) polymers is applied in all-polymer solar cells (all-PSCs) as electron acceptor, remarkably high-power conversion efficiency of 7.1% is achieved along with enhanced current density in P(NDI3-T)based all-PSCs, which is mainly attributed to red-shifted light absorption and enhanced electron-transporting ability.

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Section: Resultssupporting

confidence: 62%

Shift of the Branching Point of the Side‐Chain in Naphthalenediimide (NDI)‐Based Polymer for Enhanced Electron Mobility and All‐Polymer Solar Cell Performance

You

Kim

Cho

et al. 2018

Adv Funct Materials

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“…Thus, Kim et al synthesized as eries of alternating (P(BDTT-alt-TT-F), P1)a nd random (P(BDTT-r-TT-F), P2-P4)d onor polymers possessing complementary light absorption and used an aphthalene-diimide based polymer P(NDI2HD-T2) as the acceptor. [27] By controlling the molar ratio between the electron donating BDTT and electron accepting TT-F units from 1:1( P1), to 3:1( P2), 5:1( P3), and 7:1( P4), the absorption maximum was incrementally blue-shifted from 703 to 548 nm, which enhanced the donor:P(NDI2HD-T2) blend light absorption. Thus,t he P3:P(NDI2HD-T2) cells exhibited ah igh PCE of 6.81 %( entry 4i nT able 1) as the result of an enhanced J SC of 14.40 mA cm À2 vs.13.25, 13.40 and 12.96 mA cm À2 for the P1:P(NDI2HD-T2) (PCE = 5.63 %), P2:P(NDI2HD-T2) (PCE = 6.30 %) and P4:P(NDI2HD-T2) (PCE = 5.54 %), cells,respectively.…”

Section: Random Copolymers and Side-chain Engineeringmentioning

confidence: 99%

“…Thus,t he P3:P(NDI2HD-T2) cells exhibited ah igh PCE of 6.81 %( entry 4i nT able 1) as the result of an enhanced J SC of 14.40 mA cm À2 vs.13.25, 13.40 and 12.96 mA cm À2 for the P1:P(NDI2HD-T2) (PCE = 5.63 %), P2:P(NDI2HD-T2) (PCE = 6.30 %) and P4:P(NDI2HD-T2) (PCE = 5.54 %), cells,respectively. [27] In addition to developing random copolymers,s everal studies addressed side-chain engineering of the polymer pconjugated backbone,p articularly addressing polymer acceptors.T his strategy is effective in preserving intrinsic polymer electronic structure but strongly affects interchain interactions,s olubility,s olid-state photonic, and electrical properties. [13,28] Recently,K im and co-workers developed as eries of naphthalenediimide-bithiophene-based copolymers (P(NDIR-T2))functionalized with different side chains (R) of 2-decyltetradecyl (2-DT), 2-octyldodecyl (2-OD), and 2-hexadecyl (2-HD).…”

Section: Random Copolymers and Side-chain Engineeringmentioning

confidence: 99%

All‐Polymer Solar Cells: Recent Progress, Challenges, and Prospects

et al. 2019

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For over two decades bulk‐heterojunction polymer solar cell (BHJ‐PSC) research was dominated by donor:acceptor BHJ blends based on polymer donors and fullerene molecular acceptors. This situation has changed recently, with non‐fullerene PSCs developing very rapidly. The power conversion efficiencies of non‐fullerene PSCs have now reached over 15 %, which is far above the most efficient fullerene‐based PSCs. Among the various non‐fullerene PSCs, all‐polymer solar cells (APSCs) based on polymer donor‐polymer acceptor BHJs have attracted growing attention, due to the following attractions: 1) large and tunable light absorption of the polymer donor/polymer acceptor pair; 2) robustness of the BHJ film morphology; 3) compatibility with large scale/large area manufacturing; 4) long‐term stability of the cell to external environmental and mechanical stresses. This Minireview highlights the opportunities offered by APSCs, selected polymer families suitable for these devices with optimization to enhance the performance further, and discusses the challenges facing APSC development for commercial applications.

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“…Considerable progress has been achieved in bulk heterojunction polymer solar cells (PSCs), as emerge of the wide‐band gap polymer donors and nonfullerene acceptors . Due to the complementary absorption, appropriate energy level alignment, and meticulous morphology between donor and acceptor materials, the power conversion efficiencies (PCEs) of nonfullerene‐based PSCs close to 15% have been realized …”

Section: Introductionmentioning

confidence: 99%

Alkylsilyl Functionalized Copolymer Donor for Annealing‐Free High Performance Solar Cells with over 11% Efficiency: Crystallinity Induced Small Driving Force

Huang

Chen

Jin

et al. 2018

Adv Funct Materials

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The contradiction between enlarging the offset between energy levels of donor/acceptor and the required driving force for exciton split leads to a trade-off between open circuit voltage (V OC ) and short circuit current density (J SC ), which is a big challenge for development of high performance polymer solar cells (PSCs). Some advanced works reported the PSCs with low photon energy loss (E loss ) and small driving force, but the correlation of molecular structures of light-harvesting system and driving force is still unclear. In this work, a new alkylsilyl functionalized copolymer donor PBDS-T (PBDST: poly[(2,6trialkylsilyl thiophen2yl)benzo[1,2b:4,5b′]dithiophene))alt(5,5(1′,3′ di2thienyl5′,7′bis(2ethylhexyl)benzo[1′,2′c:4′,5′c′]dithiophene4,8dione))]) with low-lying energy levels was designed for efficient PSCs. By monitoring the Photoluminescence quenching of the bulk and bilayer heterojunctions, small driving forces, ∆E HOMO of 0.15 eV and ∆E LUMO of 0.22 eV were founded to allow for efficient charge transfer, which were observed to correlate with the crystalline PBDS-T and the optimal morphology in PBDS-T:ITIC (ITIC: 3,9bis (2methylene (3(1,1dicyanomethylene)indanone))5,5,11,11tetrakis(4hexy lphenyl) dithieno[2,3d:2′,3′d′]sindaceno[1,2b:5,6b′]dithiophene). Simultaneously improved V OC , J SC and small Eloss boosted the PCE over 11%, which is one of the highest values for annealing-free device. These results shield a light on precise design of a light-harvesting system with small driving force to simultaneously improve the V OC and J SC for highly efficient PSCs.

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Rationally Designed Donor–Acceptor Random Copolymers with Optimized Complementary Light Absorption for Highly Efficient All‐Polymer Solar Cells

Cited by 37 publications

References 70 publications

Shift of the Branching Point of the Side‐Chain in Naphthalenediimide (NDI)‐Based Polymer for Enhanced Electron Mobility and All‐Polymer Solar Cell Performance

Shift of the Branching Point of the Side‐Chain in Naphthalenediimide (NDI)‐Based Polymer for Enhanced Electron Mobility and All‐Polymer Solar Cell Performance

All‐Polymer Solar Cells: Recent Progress, Challenges, and Prospects

Alkylsilyl Functionalized Copolymer Donor for Annealing‐Free High Performance Solar Cells with over 11% Efficiency: Crystallinity Induced Small Driving Force

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