Diketopyrrolopyrrole-based conjugated polymers as additives to optimize morphology for polymer solar cells

Liao, Xunfan; Wang, Jing; Chen, Shuang-ying; Chen, Lie; Chen, Yiwang

doi:10.1007/s10118-016-1761-0

Cited by 47 publications

(26 citation statements)

References 28 publications

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“…Polymer solar cells (PSCs) have attracted great attention for their advantages such as flexibility, light weight, and low‐cost production . In the past decades, extensive efforts have been devoted to the development of photovoltaic materials and device engineering, urging the power conversion efficiencies (PCEs) of the single‐junction PSCs recently up to 14% .…”

Section: Introductionmentioning

confidence: 99%

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Liao

Xie

Chen

et al. 2019

Adv Funct Materials

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The fluorobenzotriazole (FTAZ)‐based copolymer donors are promising candidates for nonfullerene polymer solar cells (PSCs), but suffer from relatively low photovoltaic performance due to their unsuitable energy levels and unfavorable morphology. Herein, three polymer donors, L24, L68, and L810, based on a chlorinated‐thienyl benzodithiophene (BDT‐2Cl) unit and FTAZ with different branched alkyl side chain, are synthesized. Incorporation of a chlorine (Cl) atom into the BDT unit is found to distinctly optimize the molecular planarity, energy levels, and improve the polymerization activity. Impressively, subtle side chain length of FTAZ realizes a dramatic improvement in all the device parameters, as revealed by the short‐current density (Jsc) improved from 7.41 to 20.76 mA cm−2, fill‐factor from 36.3 to 73.5%, and even the open‐circuit voltage (Voc) from 0.495 to 0.790 V. The best power conversion efficiency (PCE) of 12.1% is obtained from the L810‐based device, which is one of the highest values reported for FTAZ‐based PSCs so far. Notably, the corresponding external quantum efficiency curve keeps a very prominent value up to 80% from 500 to 800 nm. The notable performance is discovered from the reduced energy loss, improved molecular face‐on orientation, the down‐shifted energy levels, and optimized absorption coefficient regulated by side‐chain engineering.

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Section: Introductionmentioning

confidence: 99%

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Liao

Xie

Chen

et al. 2019

Adv Funct Materials

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“…[1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %. Consequently,a dditive-free all-PSCs demonstrated ah igh PCE of 8.13 %, which is one of the highest performance characteristics reported for all-PSCs to date.T hese results indicate that incorporating ad ye into the n-type polymer gives insight into the precise design of high-performance polymer acceptors for all-PSCs.…”

mentioning

confidence: 99%

“…[1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %. [1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %.…”

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confidence: 99%

Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells

et al. 2018

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All-polymer solar cells (all-PSCs) can offer unique advantages for applications in flexible devices,a nd naphthalene diimide (NDI)-based polymer acceptors are the widely used polymer acceptors.H owever,t heir power conversion efficiency (PCE) still lags behind that of state-of-the-art polymer solar cells,d ue to lowl ight absorption, suboptimal energy levels and the strong aggregation of the NDI-based polymer acceptor.H erein, ar hodanine-based dye molecule was introduced into the NDI-based polymer acceptor by simple random copolymerization and showed an improved light absorption coefficient, an up-shifted lowest unoccupied molecular orbital level and reduced crystallization. Consequently,a dditive-free all-PSCs demonstrated ah igh PCE of 8.13 %, which is one of the highest performance characteristics reported for all-PSCs to date.T hese results indicate that incorporating ad ye into the n-type polymer gives insight into the precise design of high-performance polymer acceptors for all-PSCs.Polymer solar cells (PSCs) have made considerable progress during the past two decades. [1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %. [4] Recently,P CEs exceeding 13 % have been achieved with proper molecular designs of wideband-gap polymer donors and fused-ring electron acceptors. [5][6][7] Regarding fullerene-based and fused-ring electron acceptor-based devices,a ll-polymer solar cells (all-PSCs) composed of ac onjugated polymer donor and an n-type conjugated polymer offer unique attractions due to their special advantages of morphological stability and flexibility. [8][9][10][11][12][13][14][15][16] Forp ractical applications,t he morphological stability of the all-PSCs against the mechanical and thermal stresses is beneficial for applications in flexible large-scale and stable devices.Although the PCE of all-PSCs has reached 10 %, [15] the performance of all-PSCs still lag behind that of state-of-theart small-molecule-based devices,o wing to the lack of suitable n-type polymer acceptors.T od ate,t he number of polymer acceptors developed for all-PSCs are limited, and only five studies have reported all-PSCs with ap hotovoltaic efficiency over 8% for ab inary system.

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“…As depicted in the AFM phase diagram, the device active layer based on PB24‐3TDC:ITIC‐Th with 0.3% DIO exhibits a clear fibril surface with a root‐mean‐square (RMS) roughness of 1.46 nm. A set of results including DSC and GIWAXS indicate that the PB24‐3TDC has a strong crystallinity and can form ordered intermolecular π‐π stacking in the blend film, which is beneficial for the charge transfer at the donor/acceptor interface, thereby improving the photovoltaic device . In the PB68‐3TDC:ITIC‐Th with 0.3% DIO AFM diagram, the film exhibits uniform phase separation and smooth surface with RMS values around ≈1.15 nm.…”

Section: Resultsmentioning

confidence: 99%

A₁‐A₂ Type Wide Bandgap Polymers for High‐Performance Polymer Solar Cells: Energy Loss and Morphology

Liao

Chen

et al. 2018

Solar RRL

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Introducing electron‐withdrawing groups onto donor‐acceptor (D‐A) type conjugated materials is a commonly used method for lowering their highest occupied molecular orbital (HOMO) energy level to achieve higher open circuit voltage (Voc) in polymer solar cells (PSCs). However, this method is rather costly due to the tedious synthesis and low yield involved in preparing the target monomers. Here, a novel design concept of using two different acceptor units to construct acceptor1‐acceptor2 (A1‐A2) type polymers with a deep HOMO level is proposed. Two A1‐A2 type wide bandgap (WBG) polymers, PB24‐3TDC and PB68‐3TDC, were designed for PSCs. The developed polymers possess proper energy levels and complementary absorption with an efficient electron acceptor ITIC‐Th. More importantly, by slightly regulating the alkyl side‐chains, molecular stacking and photoluminescence (PL) emission energy loss of polymers can be alternated significantly. As a result, tuned Voc from 0.9 to 1.0 V and short‐circuit current (Jsc) from 9.4 to 17.0 mA cm−2 can be achieved. The device based on PB24‐3TDC:ITIC‐Th exhibits a higher power conversion efficiency (PCE) of 10.3% compared to PB68‐3TDC:ITIC‐Th based device with a PCE of 7.88%. These results show that the design concept of A1‐A2 type polymer donors have great potential for blending with non‐fullerene acceptors for achieving high performance PSCs.

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Diketopyrrolopyrrole-based conjugated polymers as additives to optimize morphology for polymer solar cells

Cited by 47 publications

References 28 publications

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells

A₁‐A₂ Type Wide Bandgap Polymers for High‐Performance Polymer Solar Cells: Energy Loss and Morphology

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Diketopyrrolopyrrole-based conjugated polymers as additives to optimize morphology for polymer solar cells

Cited by 47 publications

References 28 publications

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells

A1‐A2 Type Wide Bandgap Polymers for High‐Performance Polymer Solar Cells: Energy Loss and Morphology

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A₁‐A₂ Type Wide Bandgap Polymers for High‐Performance Polymer Solar Cells: Energy Loss and Morphology