An anomalous behavior in degraded bulk heterojunction organic solar cells

Singh, Vir; Arora, Swati; Kumar, Pankaj; Bhatnagar, P. K.; Arora, Manoj K.; Tandon, R. P.

doi:10.1088/0031-8949/84/06/065803

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Grossiord et al [15] have discussed that the overall stability of OPVs is influenced by the photoactive layer, barrier and the substrate. The degradation behavior may be divided into two broad areas [16]: one addressing the extrinsic stability which is based on the effect of atmosphere on the device, the other is the intrinsic stability due to changes in the various layers and interfaces of the devices with time [17][18][19]. Various other factors affecting the degradation of these devices have been outlined in literature [16,[20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Characterization of doped PEDOT: PSS and its influence on the performance and degradation of organic solar cells

Singh

Arora

et al. 2014

Semicond. Sci. Technol.

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The present work is a detailed study of the optical, morphological and electrical properties of poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS, films doped with ethylene glycol (EG) and multi-walled carbon nanotubes (MWCNT). The conductivity of PEDOT:PSS films doped with EG and MWCNT is higher than pristine PEDOT:PSS film. The optical transparency of PEDOT:PSS film decreases insignificantly after addition of MWCNT and EG. The films were further studied using atomic force microscopy, x-ray diffraction, Raman spectroscopy and Kelvin probe work function measurement, after which films of PEDOT:PSS with EG and MWCNT were optimized for the fabrication of solar cells. The optimized film was used as a hole extracting layer in a typical ITO/PEDOT:PSS/ P3HT:PCBM/Al solar cell. The suitable concentration for an optimized film was found to be 4% MWCNT and 1:4 ratio of EG to PEDOT:PSS. The performance of the device with doped PEDOT:PSS was found to improve in terms of short circuit current density (J SC ) and efficiency (η). The solar cell with a doped PEDOT:PSS layer showed higher J SC and η due to the increase in the interchains among PEDOT chains along with the introduction of MWCNT channels in PEDOT:PSS matrix. The degradation behavior of the cells was studied and it was found that both pristine and doped PEDOT:PSS cells showed similar trends of degradation. The performance degradation with time was also studied under variable environmental conditions, which showed different aging rates for the two devices.

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Section: Introductionmentioning

confidence: 99%

Characterization of doped PEDOT: PSS and its influence on the performance and degradation of organic solar cells

Singh

Arora

et al. 2014

Semicond. Sci. Technol.

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“…The computation of electric field has been done by using COMSOL Multiphysics software with triangular fine grid. The red region shows the high-intensity zone which can be utilized for various applications [11][12][13][14][15].…”

Section: Extinction Cross Section Of Silver and Gold Nanosphere: Semimentioning

confidence: 99%

Plasmonic Resonances and Their Application to Thin-Film Solar Cell

Pathak¹,

Kumar²,

Sharma³

2018

Emerging Solar Energy Materials

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This chapter furnishes the plasmonic properties of metal nanostructure and its application to thin-film solar cell. Plasmonics is an emerging branch of nanooptics where light metal interaction in subwavelength domain is studied. Metal supports surface plasmon resonance that has tunable signature, which depends on the morphology as well as surrounding media. These plasmonic resonances can be tuned in a broader range of solar spectra by changing several parameters such as size, shape and medium. Moreover, metals show scattering properties that could be utilized to enhance optical path length of photon inside the thin film of solar device. The chapter mainly focusses on the study of plasmonic resonance of smaller-and larger-sized metal nanoparticle using semi-analytical as well as numerical approach. For the estimation of optical properties like extinction spectrum and field profile of larger-sized nanoparticle, finite-difference time-domain (FDTD) method is used. The field distribution in both silver and gold nanoparticle cases has been plotted in 'on' resonance condition, which has a broader range of applications.

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“…Organic solar cells (OSCs) employ organic material-based light-absorbing functional layer to convert sunlight to electricity. , It is composed of a blend of donor material usually a conjugated polymer, oligomers or conjugated pigments, and a fullerene-based ([6,6]-phenyl-C 61 -butyric acid methyl ester; PCBM) acceptor material. − Fullerene derivatives have an energetically deep-lying LUMO which endows the molecule with a very high electron affinity relative to the various potential organic donors. In the early 1990s, the discovery of ultrafast charge transfer from polymer to fullerene initiated the research field of bulk heterojunction (BHJ) solar cells. , The PPV devices based on the concept of BHJ are promising candidates for providing low-cost, lightweight, large-area, and mechanically flexible energy conversion devices. ,, However, the power conversion efficiency (PCE) of PPV devices is still a step away from the commercialization target of 10% , that can be achieved by proper molecular orbital alignment between the electron donor and acceptor.…”

Section: Introductionmentioning

confidence: 99%

Optoelectronic Applications of Conjugated Organic Polymers: Influence of Donor/Acceptor Groups through Density Functional Studies

Garg

Goel

2022

J. Phys. Chem. C

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Organic photovoltaics (OPVs) are fast emerging as an attractive alternative to resolve the future energy crisis by maximum harness of solar energy. The optically active layer of OPVs consists of a p-type polymer as the donor and an n-type molecule as the acceptor. The efficiency of the polymeric donor material is decided by the type of monomeric units and nature of side groups attached to the backbone of the polymeric chain. This study focuses on the polymeric structures of polythiophene and its analogues, polyfuran and polyselenophene, to explore the relationship between structure and electronic/optical properties via static and time-dependent density functional calculations. Each polymer chain is substituted with a variety of electron releasing/accepting side groups to understand their influence on the band gap and energy shifting of frontier orbitals with respect to a well-known acceptor (phenyl-C70-butyric acid methyl ester (PC70BM)). All the underlying physical processes starting from excitation of an electron from the HOMO of the donor material to its LUMO, breaking of exciton into free charge carriers, and diffusion of a free electron and hole to the donor–acceptor interface have been investigated thoroughly. The photovoltaic efficiency has been interpreted in terms of electronic (E gap) and optical (E exe) band gap, open circuit voltage (V OC), and short circuit current density (J SC). The reported derivatives have E gap in the range 1.69–2.78 eV which enables exciton generation by photon absorption in the visible region. It has been concluded that while electron-donating groups result in maximum lowering of E gap, the CN-substituted derivatives exhibit maximum efficiency with a V OC of about 1.63–1.75 eV.

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An anomalous behavior in degraded bulk heterojunction organic solar cells

Cited by 10 publications

References 16 publications

Characterization of doped PEDOT: PSS and its influence on the performance and degradation of organic solar cells

Characterization of doped PEDOT: PSS and its influence on the performance and degradation of organic solar cells

Plasmonic Resonances and Their Application to Thin-Film Solar Cell

Optoelectronic Applications of Conjugated Organic Polymers: Influence of Donor/Acceptor Groups through Density Functional Studies

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