Highly efficient charge-carrier generation and collection in polymer/polymer blend solar cells with a power conversion efficiency of 5.7%

Mori, Daisuke; Benten, Hiroaki; Okada, Izumi; Ohkita, Hideo; Ito, Shinzaburo

doi:10.1039/c4ee01326c

Cited by 268 publications

(263 citation statements)

References 43 publications

(59 reference statements)

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“…10,11 Thereafter, fullerene-free solar cells and specifically perylene derivatives have seen a drastic improvement in the PCE higher than 6%. [12][13][14][15][16][17][18][19][20][21] Recently, we demonstrated that disrupting the planarity of the perylene by perpendicularly orienting two units reduces the co-facial stacking and hence improved the blend morphology. This resulted in an order of magnitude increase in the short circuit current density in OPVs made from this acceptor material.…”

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confidence: 99%

Interface engineering for efficient fullerene-free organic solar cells

Shivanna

Rajaram

Narayan

2015

Applied Physics Letters

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We demonstrate the role of zinc oxide (ZnO) morphology and addition of an acceptor interlayer to achieve high efficiency fullerene-free bulk heterojunction inverted organic solar cells. Nanopatterning of the ZnO buffer layer enhances the effective light absorption in the active layer, and the insertion of a twisted perylene acceptor layer planarizes and decreases the electron extraction barrier. Along with an increase in current homogeneity, the reduced work function difference and selective transport of electrons prevent the accumulation of charges and decrease the electron-hole recombination at the interface. These factors enable an overall increase of efficiency to 4.6%, which is significant for a fullerene-free solution-processed organic solar cell.

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confidence: 99%

Interface engineering for efficient fullerene-free organic solar cells

Shivanna

Rajaram

Narayan

2015

Applied Physics Letters

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“…[15][16][17][18][19][20][21] However, the PCEs of the record all-PSCs are still behind those of the state-of-the-art PC 71 BM-based PSCs. [22][23][24][25][26] Among the high-performance all-PSCs to date, a relatively high short-circuit current density (J sc ) of 18.6 mA cm −2 , [27] or a high fill factor (FF) over 0.7 are achieved individually, [24,26,28] approaching to those of the record-efficiency PC 71 BM-based PSCs.…”

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confidence: 99%

8.0% Efficient All‐Polymer Solar Cells with High Photovoltage of 1.1 V and Internal Quantum Efficiency near Unity

Zhang

et al. 2017

Advanced Energy Materials

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In very recent years, growing efforts have been devoted to the development of all‐polymer solar cells (all‐PSCs). One of the advantages of all‐PSCs over the fullerene‐based PSCs is the versatile design of both donor and acceptor polymers which allows the optimization of energy levels to maximize the open‐circuit voltage (Voc). However, there is no successful example of all‐PSCs with both high Voc over 1 V and high power conversion efficiency (PCE) up to 8% reported so far. In this work, a combination of a donor polymer poly[4,8‐bis(5‐(2‐octylthio)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl‐alt‐(5‐(2‐ethylhexyl)‐4H‐thieno[3,4‐c]pyrrole‐4,6(5H)‐dione)‐1,3‐diyl] (PBDTS‐TPD) with a low‐lying highest occupied molecular orbital level and an acceptor polymer poly[[N,N′‐bis(2‐octyldodecyl)‐naphthalene‐1,4,5,8‐bis(dicarboximide)‐2,6‐diyl]‐alt‐thiophene‐2,5‐diyl] (PNDI‐T) with a high‐lying lowest unoccupied molecular orbital level is used, realizing high‐performance all‐PSCs with simultaneously high Voc of 1.1 V and high PCE of 8.0%, and surpassing the performance of the corresponding PC71BM‐based PSCs. The PBDTS‐TPD:PNDI‐T all‐PSCs achieve a maximum internal quantum efficiency of 95% at 450 nm, which reveals that almost all the absorbed photons can be converted into free charges and collected by electrodes. This work demonstrates the advantages of all‐PSCs by incorporating proper donor and acceptor polymers to boost both Voc and PCEs.

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“…These properties of the polymer/polymer blend system are greatly beneficial for future applications in portable and wearable devices that require both high performances and mechanical stability [1]. Therefore, polymer/polymer blend solar cells have recently received considerable attention and significant strides have been made in improving their power conversion efficiencies (PCEs) [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of low-bandgap polymers as both the donor and acceptor inevitably results in weak light absorptivity in the visible region, owing to the intrinsic narrow absorption bandwidths of organic semiconductors [7,8]. Therefore, further improvement of the PCE requires new design strategies that can enhance the weak absorption in the visible range, while taking full advantage of the excellent photovoltaic conversion capacity of low-bandgap donor/acceptor polymer blends.…”

Section: Introductionmentioning

confidence: 99%

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Ternary Blend of Conjugated Polymers for Broadening the Absorption Bandwidth of Polymer Solar Cells

Benten

Nishida

Mori

et al. 2016

J. Photopol. Sci. Technol.

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Ternary blend all-polymer solar cells are developed to broaden the absorption bandwidth of the photoactive layer. A wide-bandgap polymer with absorption in the visible region is introduced as a third polymer into a low-bandgap donor/acceptor binary polymer blend showing absorption in the near-infrared (NIR) region. In the ternary blend solar cell, the external quantum efficiency (EQE) is improved in the visible wavelength region, while retaining the excellent EQE of the host binary blend in the NIR wavelength region. These results demonstrate that the use of ternary blends of conjugated polymers containing a wide-bandgap polymer as a visible sensitizer is an effective approach for improving the efficiency of all-polymer solar cells.

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Highly efficient charge-carrier generation and collection in polymer/polymer blend solar cells with a power conversion efficiency of 5.7%

Cited by 268 publications

References 43 publications

Interface engineering for efficient fullerene-free organic solar cells

Interface engineering for efficient fullerene-free organic solar cells

8.0% Efficient All‐Polymer Solar Cells with High Photovoltage of 1.1 V and Internal Quantum Efficiency near Unity

Ternary Blend of Conjugated Polymers for Broadening the Absorption Bandwidth of Polymer Solar Cells

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