Performance characteristics of pentacene-based organic photovoltaic cells

Hwang, Jin Yeon; Sunesh, Chozidakath Damodharan; Chandran, M.; Lee, Jungrae; Choe, Youngson

doi:10.1016/j.orgel.2012.05.042

Cited by 9 publications

(5 citation statements)

References 53 publications

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“…This increase is expected, as the large PCBM crystallites block or scatter a larger fraction of the incident light at all wavelengths, the result of which is a higher absorbance background. Interestingly, there is no evident absorbance of Pc at 660 nm18 in the Pc‐containing device.…”

Section: Resultsmentioning

confidence: 97%

Enhanced Thermal Stability of Inverted Polymer Solar Cells with Pentacene

Yang

Kim

et al. 2015

Israel Journal of Chemistry

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[a] 1IntroductionFabricated by cost-effective solution processing,p olymer solar cells have attracted considerable attention in the last decade.[1] Thep erformance of polymer solar cells has been improved by new organic materials,device engineering, and manufacturing processes.T he PCE of organic solar cells is 8-11 %w ith new materials and novel device structure. [2,3] There are two important factors for organic solar cells -efficiencyand stability.T he invertedstructure of polymer solar cells has caught wide attentionb ecause of its good performance in efficiency and stability.Thermal stability is one of the important aspectso fi nverted polymer solar cells,a nd the active layer is ak ey contributor to this stability.T he active layer of polymer solar cells is composed of ap olymer donor and af ullerene-derived acceptor. Thel ayer has the tendency to rapidly coarsen when annealed above its glass transition temperature.[4] Thed istribution of donor and acceptor molecules is crucial for maximizing the photovoltaicp erformance.T he phase separation of donor and acceptor domains improves charge transport to the electrodes.A large contact area between donor and acceptor aids holeelectron pair generation, and thus,afinely interpenetrating donor-acceptor network is favored in the active layer. Thei nterpenetrating donor-acceptor networks and the phase separation are very sensitivet ot hermal treatments. Elevated processing and operating temperatures are real challenges to the thermal stabilityo fi nverted polymer solar cells,w hich mustb es olved priort op ractical applications.T ypically during the thermal treatmentp rocess, the distributiono ft he fullerene material in the blend is very difficult to control.Thef ullerene derivative PCBM has ag lass transition temperatureo fa bout 110-140 8C. [5,6] It is very important to fix the phase separation between PCBM andt he polymer after evaporationo ft he processing solvent. However, above glass transition temperature,f ullerene molecules start to slowly aggregatea nd form micrometer-sized crystals. [4,7,8] Overgrown crystalsofPCBM cause adramatic decrease in PCE. [9,10] Manyr esearch groups have explored strategies to control the donor-acceptori nterfaces in the active layer. Thef irst approachi nvolves cross-linking reactions of the polymer [11,12] or fullerene [13,14] in the active layer. Thec ross-linked molecules preventf urther coarsening of the polymera nd fullerene phases and improve thermals tability.H owever, cross-linkingr eactions Abstract:I nt his study,w ef ocused on the thermal stability of organic solar cells based on poly(3-hexylthiophene) (P3HT) and (6,6)-phenylC 61 -butyric acid methyl ester (PCBM), fabricated by blends of P3HT :PCBM :pentacene. Enhanced thermal stability of organic solarc ells was achieved by introducingp entacene (Pc)i nto blendso f P3HT :PCBM in organics olar cells with the structure indium tin oxide/ZnO/P3HT :PCBM :Pc/poly(3,4-ethylenedioxythiophene) :polystyrene sulfonate/Ag (ITO/ZnO/ P3HT :PCBM :Pc/PEDOT:PSS/Ag). The donor-acce...

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Section: Resultsmentioning

confidence: 97%

Enhanced Thermal Stability of Inverted Polymer Solar Cells with Pentacene

Yang

Kim

et al. 2015

Israel Journal of Chemistry

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“…The EDX result demonstrates that the carbon element distributes homogeneously throughout the whole microstructure ( Figure 1 d), confirming the successful deposition of pentacene. In addition, as can be seen from the Atomic Force Microscope (AFM) image shown in Figure 1 e, the surface of the disc-like micropattern is rough and the current micropattern has a thickness of around 55 nm ( Figure 1 f) [ 52 ]. We further studied the detailed structure of this micropump.…”

Section: Resultsmentioning

confidence: 99%

A Light-Powered Micropump with Dynamic Collective Behavior for Reparation

Sun,

Wang,

Jiang

et al. 2024

Nanomaterials

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Inspired by the collective behaviors of active systems in nature, the collective behavior of micromotors has attracted more and more attention in recent years. However, little attention has been paid to the collective behavior of the immobilized micromotor, i.e., the micropump. In this paper, a unique pentacene-based micropump is reported, which demonstrates dynamic collective behavior activated by white light irradiation. The light irradiation may generate the photochemical reactions between pentacene and water, leading to the electroosmotic flow. As a result, this micropump is capable of pumping the surrounding solution inward along the substrate surface based on the electroosmosis mechanism. Intriguingly, the inward pumping causes the agglomeration of the tracer particles on the surface of the micropump. In addition, the aggregation can migrate following the change in the light irradiation position between two adjacent micropumps. Based on the aggregating and migrating behaviors of this pentacene-based micropump, we have achieved the conductivity restoration of the cracked circuit.

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“…Indeed, reports of other pentacene solar cells find that PEDOT:PSS increases the crystalline content 15 and performance. 16 Due to the dispersion of the DBR, the absorption enhancement shifts to higher frequencies for angles off normal incidence as shown in the simulated device absorption in Figure 2(a). The band edge can be spectrally tuned by tilting the device relative to the incident light.…”

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confidence: 89%

Slow light enhanced singlet exciton fission solar cells with a 126% yield of electrons per photon

Thompson

Congreve

Goldberg

et al. 2013

Applied Physics Letters

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Singlet exciton fission generates two triplet excitons per absorbed photon. It promises to increase the power extracted from sunlight without increasing the number of photovoltaic junctions in a solar cell. We demonstrate solar cells with an external quantum efficiency of 126% by enhancing absorption in thin films of the singlet exciton fission material pentacene. The device structure exploits the long photon dwell time at the band edge of a distributed Bragg reflector to achieve enhancement over a broad range of angles. Measuring the reflected light from the solar cell establishes a lower bound of 137% for the internal quantum efficiency.

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Performance characteristics of pentacene-based organic photovoltaic cells

Cited by 9 publications

References 53 publications

Enhanced Thermal Stability of Inverted Polymer Solar Cells with Pentacene

Enhanced Thermal Stability of Inverted Polymer Solar Cells with Pentacene

A Light-Powered Micropump with Dynamic Collective Behavior for Reparation

Slow light enhanced singlet exciton fission solar cells with a 126% yield of electrons per photon

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