Relation between the barrier interface and the built-in potential in pentacene/C60 solar cell

Nolasco, J. C.; Sánchez-Díaz, Antonio; Cabré, Roser Bono; Ferré‐Borrull, Josep; Marsal, Lluís F.; Palomares, Emilio; Pallarès, Josep

doi:10.1063/1.3456393

Cited by 40 publications

(43 citation statements)

References 16 publications

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“…[ 31 ] Probing the capacitance vs. voltage over different frequencies demonstrates that the slopes in both regions I and II remain constant but a shift in the characteristics with increasing frequencies to higher forward voltages can be observed. This implies that the built-in voltages, which are given by the extrapolated interception of the respective region with the voltage axis, depend on the frequency applied during the measurement, an indication that interface traps are present.…”

Section: Resultsmentioning

confidence: 95%

Degradation Effects Related to the Hole Transport Layer in Organic Solar Cells

Ecker

Nolasco

Pallarès

et al. 2011

Adv Funct Materials

172

154

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The influence of the hole transport layer on device stability in polymer:fullerene bulk‐heterojunction solar cells is reported. Three different hole transport layers varying in composition, dispersion solvent, electrical conductivity, and work function were used in these studies. Two water‐based hole transport layers, poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) and polyaniline:poly(styrene sulfonate), and one isopropyl alcohol‐based polyaniline:poly(styrene sulfonate) transport layer were investigated. Solar cells with the different hole transport layers were fabricated and degraded under illumination. Current–voltage, capacitance–voltage, and capacitance–frequency data were collected at light intensities of 16, 30, 48, 80, and 100 mW cm−2 over a period of 7 h. Device performance and stability were compared between nonencapsulated and encapsulated samples to gain understanding about degradation effects related to oxygen and water as well as degradation mechanisms related to the intrinsic instability of the solar cell materials and interfaces. It is demonstrated that the properties of the hole transport layer can have a significant impact on the stability of organic solar cells.

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Section: Resultsmentioning

confidence: 95%

Degradation Effects Related to the Hole Transport Layer in Organic Solar Cells

Ecker

Nolasco

Pallarès

et al. 2011

Adv Funct Materials

172

154

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show abstract

“…It has been known that inorganic, hybrid organicinorganic and organic heterojunction solar cells suffer from the presence of electrically active interface states at the heterojunction interface [14][15][16][17]. The interface states create energy states distributed within band gap.…”

Section: Introductionmentioning

confidence: 99%

Quantifying interface states and bulk defects in high‐efficiency solution‐processed small‐molecule solar cells by impedance and capacitance characteristics

Брус

Kyaw

Maryanchuk

et al. 2015

Progress in Photovoltaics

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The AC properties of high-efficiency (η = 8.01% under standard 100 mW/cm 2 AM1.5 illumination) small-molecule bulk heterojunction (SM BHJ) solar cells (p-DTS(FBTTh 2 ) 2 /PC 70 BM) at different DC biases and frequencies of small amplitude (±10 mV) AC signal in the dark at room temperature were investigated in details. We showed the presence of interface states at the heterojunction interface and determined their parameters from the analysis of spectral distributions of real and imaginary components of the measured impedance. The dielectric constant of BHJ ε BHJ = 2.9 was determined from the geometrical capacitance of totally depleted BHJ layer. We explained quantitatively the effect of interface states and series resistance on the measured C-V characteristics of the SM BHJ solar cells at both low and high frequencies. The quantitative value of the density of defect states in the bulk N = 1.05 × 10 16 cm À3 was determined from the high frequency C-V characteristic corrected by the effect of the series resistance.

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“…Among these materials, molecular semiconductors of the oligoacene family have attracted attention due to their promising high charge carrier mobilities, which enable them to be incorporated in functional devices such as light-emitting diodes [1,2], field effect transistors [3][4][5][6][7][8] and photovoltaics [9][10][11][12]. The molecules within oligoacene crystals are bound together by van der Waals (vdW) dispersion forces.…”

Section: Introductionmentioning

confidence: 99%

A first-principles study of the vibrational properties of crystalline tetracene under pressure

Abdulla

Refson

Friend

et al. 2015

J. Phys.: Condens. Matter

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We present a comprehensive study of the hydrostatic pressure dependence of the vibrational properties of tetracene using periodic density-functional theory (DFT) within the local density approximation (LDA). Despite the lack of van der Waals dispersion forces in LDA we find good agreement with experiment and are able to assess the suitability of this approach for simulating conjugated organic molecular crystals. Starting from the reported Xray structure at ambient pressure and low temperature, optimised structures at ambient pressure and under 280 MPa hydrostatic pressure were obtained and the vibrational properties calculated by the linear response method. We report the complete phonon dispersion relation for tetracene crystal and the Raman and infrared spectra at the centre of the Brillouin zone.The intermolecular modes with low frequencies exhibit high sensitivity to pressure and we report mode-specific Grüneisen parameters as well as an overall Grüneisen parameter γ=2.8.Our results suggest that the experimentally reported improvement of the photocurrent under pressure may be ascribed to an increase in intermolecular interactions as also the dielectric tensor.2

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Relation between the barrier interface and the built-in potential in pentacene/C60 solar cell

Cited by 40 publications

References 16 publications

Degradation Effects Related to the Hole Transport Layer in Organic Solar Cells

Degradation Effects Related to the Hole Transport Layer in Organic Solar Cells

Quantifying interface states and bulk defects in high‐efficiency solution‐processed small‐molecule solar cells by impedance and capacitance characteristics

A first-principles study of the vibrational properties of crystalline tetracene under pressure

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