Enhanced Efficiency of Single and Tandem Organic Solar Cells Incorporating a Diketopyrrolopyrrole‐Based Low‐Bandgap Polymer by Utilizing Combined ZnO/Polyelectrolyte Electron‐Transport Layers

Jo, Jang; Pouliot, Jean; Wynands, David; Collins, Samuel D.; Kim, Jin Young; Nguyen, Thanh Luan; Woo, Han Young; Sun, Yanming; Leclerc, Mario; Heeger, Alan J.

doi:10.1002/adma.201301288

Cited by 114 publications

(82 citation statements)

References 44 publications

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“…Electronic properties of thin and ultra-thin conjugated organic films and of their hetero-junctions with metals and inorganic semiconductors have attracted scientific interest because of possible applications in chemical sensing, light-emitting and photovoltaic devices [1][2][3][4][5]. The surface science techniques were used successfully to characterize the interfacial band alignment and the density of the electronic states at organic film interfaces with metal and semiconductor surfaces [6,7].…”

Section: Introductionmentioning

confidence: 99%

Low-energy electron transmission for the analysis of the interface barrier formation and the density of the unoccupied electronic states in the ultra-thin layers of fluorinated copper-phthalocyanine

Komolov¹,

Lazneva²,

Akhremtchik³

et al. 2015

Organic Photonics and Photovoltaics

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Abstract:The interfacial structure made from the thermally deposited 5 -7 nm thick layers of hexadecafluoro copper phthalocyanine (F 16 -CuPc) and of the unsubstituted copper phthalocyanine (CuPc) was subjected to the studies. The surface work function and the density of the unoccupied electron states (DOUS) located 5-20 eV above the Fermi level (E F ) were investigated during the CuPc/F 16 -CuPc interface formation using the very low energy electron diffraction (VLEED) method and the total current spectroscopy (TCS) measurement scheme. The DOUS peak structure of the organic films studied obtained from the TCS results showed a good correspondence to the main π* and σ* DOUS bands obtained from the density functional theory (DFT) calculations. The interfacial barrier was characterized by the negative charge transfer from the CuPc overlayer to the F 16 -CuPc underlayer occurred within the 5 nm thick interfacial region in the CuPc overlayer which was accompanied by the decrease of the surface work function from 4.9±0.1 eV to 4.3±0.1 eV. The stabilization of the π* DOUS bands, as well as restructuring of the low lying σ* bands was observed in the in the case of the fluorinated film (F 16 -CuPc) compared to the case of the unsubstituted CuPc film.

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Section: Introductionmentioning

confidence: 99%

Low-energy electron transmission for the analysis of the interface barrier formation and the density of the unoccupied electronic states in the ultra-thin layers of fluorinated copper-phthalocyanine

Komolov¹,

Lazneva²,

Akhremtchik³

et al. 2015

Organic Photonics and Photovoltaics

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“…Recently, laboratory-scale bulk heterojunction (BHJ) solar cells have reached the milestone of 11% [4], through a synergic development of increasingly high performing photoactive materials [5][6][7][8][9], understanding of the morphological film nanostructure [10,11] and device structure optimization [12][13][14][15][16][17][18]. However, the achievement of high performance has little technological impact if the resulting device lifetime is unsuitable for the technological requirements.…”

Section: Introductionmentioning

confidence: 99%

Predicting thermal stability of organic solar cells through an easy and fast capacitance measurement

Tessarolo

Guerrero

Gedefaw

et al. 2015

Solar Energy Materials and Solar Cells

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Degradation of Organic Photovoltaic (OPV) devices is currently a topic under intense research as it is one of the main limitations towards the commercialization of this technology. Morphological changes at both active layer and interfaces with the outer contacts are believed to determine main key issues to be overcome. In-line techniques are essential to rule out any effect arising during sample fabrication.Unfortunately, the number of physical techniques able to provide morphological information on complete and operational devices is certainly limited. In this work, we study the thermal degradation of bulk heterojunction (BHJ) solar cells composed by different donor polymers with techniques developed to provide in-situ information on operational devices. Capacitance measurement as a function of temperature monitors the electrical integrity of the active layer and provides the threshold temperature (T MAX ) at which the whole device becomes thermally unstable. We found a direct correlation between the threshold temperature T MAX , obtained by capacitance-temperature measurements on complete OPV devices, and the power conversion efficiency decay measured at 85°C. Devices show to be thermal stable when the temperature of the thermal stress is below the T MAX , while above the T MAX evident changes in the active layer or at the active layer/electrode interface are also detected by confocal fluorescence microscopy. The capacitance method gives precious guidelines to predict the thermal stability of BHJ solar cells using accelerated and easy tests.

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“…This concept addresses both losses: the J sc related absorption losses as well as the V oc related thermalization losses. In the last few years, a number of organic tandem solar cells with high efficiencies were reported, 8,[15][16][17][18][19][20][21][22] and the efficiency roadmap for tandem cells is clearly pointing towards the predicted 15%. 23 To realize high performance organic tandem solar cells, an efficient and reliable intermediate layer (IML) is required, which is typically designed from a series-connected sequence of a holetransporting layer (HTL) and an electron-transporting layer (ETL).…”

Section: Introductionmentioning

confidence: 99%

“…Today's reference materials for the IMLs are poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) for the hole injection and either titanium oxide (TiOx) 26 or zinc oxide (ZnO) 8,[15][16][17][18][19][20] for the electron injection. Solution-processed p-type metal oxides, such as vanadium pentoxide (V 2 O 5 ), 27,28 molybdenum trioxide (MoO 3 ) 29,30 and tungsten trioxide (WO 3 ), 31,32 were reported as substitutions for the widely used PEDOT:PSS, owing to the comparable device performances but enhanced environmental lifetime for single-junction solar cells.…”

Section: Introductionmentioning

confidence: 99%

A universal method to form the equivalent ohmic contact for efficient solution-processed organic tandem solar cells

Stubhan

Krantz

et al. 2014

J. Mater. Chem. A

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Enhanced Efficiency of Single and Tandem Organic Solar Cells Incorporating a Diketopyrrolopyrrole‐Based Low‐Bandgap Polymer by Utilizing Combined ZnO/Polyelectrolyte Electron‐Transport Layers

Cited by 114 publications

References 44 publications

Low-energy electron transmission for the analysis of the interface barrier formation and the density of the unoccupied electronic states in the ultra-thin layers of fluorinated copper-phthalocyanine

Low-energy electron transmission for the analysis of the interface barrier formation and the density of the unoccupied electronic states in the ultra-thin layers of fluorinated copper-phthalocyanine

Predicting thermal stability of organic solar cells through an easy and fast capacitance measurement

A universal method to form the equivalent ohmic contact for efficient solution-processed organic tandem solar cells

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