Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure

He, Zhicai; Zhong, Chengmei; Su, Shi‐Jian; Xu, Miao; Wu, Hongbin; Cao, Yong

doi:10.1038/nphoton.2012.190

Cited by 3,669 publications

(2,952 citation statements)

References 32 publications

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“…[1][2][3][4][5][6][7][8] These improvements have been mainly driven by significant progresses in materials synthesis and device engineering. In spite of the great success in device efficiency, many fundamental issues concerning basic operational mechanisms of these devices remain unknown or controversial, limiting further improvement of the device performance.…”

Section: Introductionmentioning

confidence: 99%

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Gao

Inganäs

2014

Phys. Chem. Chem. Phys.

204

252

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Charge generation in organic solar cells is a fundamental yet heavily debated issue. This article gives a balanced review of different mechanisms proposed to explain efficient charge generation in polymer-fullerene bulk-heterojunction solar cells. We discuss the effect of charge-transfer states, excess energy, external electric field, temperature, disorder of the materials, and delocalisation of the charge carriers on charge generation. Although a general consensus has not been reached yet, recent findings, based on both steady-state and transient measurements, have significantly advanced our understanding of this process.2

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Section: Introductionmentioning

confidence: 99%

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Gao

Inganäs

2014

Phys. Chem. Chem. Phys.

204

252

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“…[14][15] With the PTB7:PC 71 BM the average efficiency from many different research groups best cells is 7.98% 16 while a certified efficiency above 9 % has been reported once. 14 However, further increasing the PCE is severely limited by the low charge carrier mobility.…”

Section: Introductionmentioning

confidence: 97%

4-Terminal Tandem Photovoltaic Cell Using Two Layers of PTB7:PC₇₁BM for Optimal Light Absorption

Mantilla-Pérez

Martínez-Otero

Romero‐Gómez

et al. 2015

ACS Appl. Mater. Interfaces

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Abstract:A 4-terminal architecture is proposed in which two thin active layers (< 100 nm) of PTB7:PC 71 BM are deposited on a two-sided ITO covered glass substrate. By modelling the electric field distribution inside the multilayer structure and applying an inverse solving problem procedure we designed an optimal device architecture tailored to extract the highest photocurrent possible. By adopting such 4-terminal configuration we numerically demonstrated that even when the two sub-cells use identical absorber materials, the performance of the 4-terminal device may overcome the performance of the best equivalent single junction device. In an experimental implementation of such 4-terminal device we demonstrate the viability of the approach and find a very good match with the trend of the numerical predictions.

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“…[7][8][9] Furthermore, their good filmforming ability and orthogonal solubility provide the potential for large area processing in a roll-to-roll or inkjet printing manufacturing. 10 Most of the recently explored CPEs based EC interlayers were comprised of a conjugated polymer backbone, such as polyfluorene, [11][12] polythiophene, 13 and polycarbazole, 14 tethered with numerous polar groups, such as N, N-dimethylamino, 15,16 ammonium, 17 diethanolamino, 18 and phosphonate. 19 It is worth noting that the widely utilized p-type conjugated backbones are not favorable for electron transport, thus requiring ultra-thin film to prevent the possible increased electron extraction barrier.…”

Section: Introductionmentioning

confidence: 99%

High Efficiency Inverted Organic Solar Cells with a Neutral Fulleropyrrolidine Electron-Collecting Interlayer

Yan

Kan

et al. 2016

ACS Appl. Mater. Interfaces

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A novel fulleropyrrolidine derivative, named as FPNOH, was designed, synthesized and utilized as an efficient electron-collecting (EC) layer for inverted organic solar cells (i-OSCs). The grafted diethanolamino-polar moieties can not only trigger its function as an EC interlayer, but also induce orthogonal solubility that guarantees subsequent multi-layer processing without interfacial mixing. A higher power conversion efficiency (PCE) value of 8.34% was achieved for i-OSC devices with ITO/FPNOH EC electrode, compared to that of the sol-gel ZnO based reference devices with an optimized PCE value of 7.92%. High efficiency exceeding 7.7% was still achieved even for the devices with a relatively thick PFNOH film (16.9 nm). It is worthwhile to mention that this kind of material exhibits less thickness dependent performance, in contrast to widely utilized p-type conjugated polyelectrolytes (CPEs) as well as the non-conjugated polyelectrolytes (NCPEs). Further investigation on illuminating intensity dependent parameters revealed the role of FPNOH in reducing interfacial traps-induced recombination at ITO/active layer interface.

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Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure

Cited by 3,669 publications

References 32 publications

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Charge generation in polymer–fullerene bulk-heterojunction solar cells

4-Terminal Tandem Photovoltaic Cell Using Two Layers of PTB7:PC₇₁BM for Optimal Light Absorption

High Efficiency Inverted Organic Solar Cells with a Neutral Fulleropyrrolidine Electron-Collecting Interlayer

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Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure

Cited by 3,669 publications

References 32 publications

Charge generation in polymer–fullerene bulk-heterojunction solar cells

Charge generation in polymer–fullerene bulk-heterojunction solar cells

4-Terminal Tandem Photovoltaic Cell Using Two Layers of PTB7:PC71BM for Optimal Light Absorption

High Efficiency Inverted Organic Solar Cells with a Neutral Fulleropyrrolidine Electron-Collecting Interlayer

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4-Terminal Tandem Photovoltaic Cell Using Two Layers of PTB7:PC₇₁BM for Optimal Light Absorption