Role of Majority and Minority Carrier Barriers Silicon/Organic Hybrid Heterojunction Solar Cells

Avasthi, Sushobhan; Lee, Stephanie S.; Loo, Yueh Lin; Sturm, James C.

doi:10.1002/adma.201102712

Cited by 199 publications

(129 citation statements)

References 20 publications

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“…[ 3,4 ] Therefore, there has been considerable interest in organic/c-Si heterojunction solar cells that use organic conductive polymers, such as poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), which block electrons but let holes pass. [5][6][7][8][9][10][11] The single heterojunction of PEDOT:PSS/c-Si works as a photovoltaic device without using the p-n junction and TCO layer. η values of 10-13% have been achieved by adjusting the fi lm thickness of conductive PEDOT:PSS and the resistivity of the c-Si substrate without using textured c-Si, an anti-refl ection (AR) coating layer, and a back-surface fi eld (BSF) layer.…”

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confidence: 99%

Highly Efficient Solution‐Processed Poly(3,4‐ethylenedio‐xythiophene):Poly(styrenesulfonate)/Crystalline–Silicon Heterojunction Solar Cells with Improved Light‐Induced Stability

Liu

Ishikawa

Funada

et al. 2015

Advanced Energy Materials

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p‐Toluenesulfonic acid/dimethyl sulfoxide (PTSA/DMSO)‐treated poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/crystalline‐silicon (c‐Si) hybrid solar cells with a solution‐processed anti‐reflection coating of TiO2 exhibit a record power conversion efficiency of 15.5%. Additionally, the performance stability of the hybrid device for both air storage and light exposure is improved due to removal of the PSS matrix from the PTSA/DMSO‐treated PEDOT:PSS thin film.

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confidence: 99%

Highly Efficient Solution‐Processed Poly(3,4‐ethylenedio‐xythiophene):Poly(styrenesulfonate)/Crystalline–Silicon Heterojunction Solar Cells with Improved Light‐Induced Stability

Liu

Ishikawa

Funada

et al. 2015

Advanced Energy Materials

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“…[26,27] Schottky junction photovoltaics (some with significant efficiencies) are, of course, well-studied devices. [28][29][30][31][32][33][34] Most are based on bulk interfaces as with the most common p-n photovoltaics in which one of the semiconductor layers is replaced with a material that behaves as a metal, often ITO, which also has the beneficial property of being transparent to light. Additionally, a device that foreshadows what we report here, consisting of GaAs rods produced by dry etching a GaAs single crystal through a "mask" formed by close-packed silica microspheres, which are pressed against PEDOT:PSS has also been reported.…”

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High‐Efficiency Panchromatic Hybrid Schottky Solar Cells

et al. 2012

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Keywords: Hybrid solar cell, cadmium selenide, PEDOT:PSS, Schottky barrier, internal quantum efficiency.Photovoltaics based on inorganic materials (for example, the Cd chalcogenides) show high efficiencies due to their excellent charge carrier mobility and carrier collection capability. [1][2][3][4][5][6][7] However, their constituent materials are generally more expensive, and their fabrication is more complex [8,9] than in organic photovoltaics. [10][11][12] Organics, however, tend towards lower charge carrier mobility and short exciton diffusion lengths leading to low short circuit currents and increased carrier recombination, often resulting in lower efficiencies. [13,14] Fabricated judiciously, hybrid photovoltaics combining inorganic and organic materials may avoid one or more of these drawbacks. [15] Inorganic semiconductors (CdSe, CdS, n-Si, nCdTe, TiO 2 , ZnO, etc) are often used as electron acceptors due to their large carrier mobility, long exciton diffusion length and effective light absorption. [15][16][17][18][19][20][21][22][23] And, organic semiconductors, which have large absorption coefficients, are commonly used in hybrid solar cells as electron- Advanced Materials 25, 256-260 (2013) DOI: 10.1002 Submitted to 2 donors, making use of their significant hole mobility which often exceeds their electron mobility. [24] Bulk heterojunction (BHJ) hybrid solar cells, first demonstrated by Alivisatos, employ semiconductor nanocrystals dispersed in conducting polymer. [15] In BHJ solar cells, the separation of excitons occurs efficiently due to the short distances the carriers need to traverse and large interface between the conducting polymer and the inorganic semiconductor. On the other hand, charge carrier collection is limited by the poor charge transport that occurs via electron hopping among the poorly connected semiconductor nanocrystals. Highly ordered inorganic semiconductor nanorods grown vertically from the substrate up, can remedy the poor conductance of materials comprised of compacted nanocrystals, resulting in better transfer of electrons from the p-n junctions to the external circuit. [3,16,25] Recently we described such a hybrid photovoltaic comprised of ordered CdSe nanorods embedded in a conductive polymer (poly 3-hexylthiophene (P3HT)). [16] We noted that deep in the red, where only the CdSe absorbed light the internal quantum efficiency of the cell was very high; yet the overall external efficiency of the device was only slightly above 1%, due to the fact that the P3HT absorbed over a substantial portion of the visible spectrum, but was inefficient in transferring holes to the external circuit on account of this material's small recombination length. In essence, the P3HT absorbed a large portion of the incoming photons whose energies it subsequently wasted. We reasoned that if we were to replace the P3HT with a p-type polymer with very low light absorbance, making the CdSe essentially the sole lightharvesting material, the external efficiency of the device would improve significantly...

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“…Yet, PEDOT:PSS suffers from chemical instability related to its hygroscopic character and can cause severe device degradation [6]. A variety of p-type polymeric semiconductors have also been studied for silicon hybrid devices [7,8], although they could suffer from similar instability issues.…”

Section: Introductionmentioning

confidence: 99%

Transition metal oxides as hole-selective contacts in silicon heterojunctions solar cells

Gerling

Mahato

Morales-Vilches

et al. 2016

Solar Energy Materials and Solar Cells

362

281

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This work reports on a comparative study comprising three transition metal oxides, MoO 3 , WO 3 and V 2 O 5 , acting as front p-type emitters for n-type crystalline silicon heterojunction solar cells. Owing to their high work functions (>5 eV) and wide energy band gaps, these oxides act as transparent hole-selective contacts with semiconductive properties that are determined by oxygen-vacancy defects (MoO 3-x ), as confirmed by x-ray photoelectron spectroscopy. In the fabricated hybrid structures, 15 nm thick transition metal oxide layers were deposited by vacuum thermal evaporation. Of all three devices, the V 2 O 5 /n-silicon heterojunction performed the best with a conversion efficiency of 15.7% and an open-circuit voltage of 606 mV, followed by MoO 3 (13.6%) and WO 3 (12.5%). These results bring into view a new silicon heterojunction solar cell concept with advantages such as the absence of toxic dopant gases and a simplified low-temperature fabrication process.

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Role of Majority and Minority Carrier Barriers Silicon/Organic Hybrid Heterojunction Solar Cells

Cited by 199 publications

References 20 publications

Highly Efficient Solution‐Processed Poly(3,4‐ethylenedio‐xythiophene):Poly(styrenesulfonate)/Crystalline–Silicon Heterojunction Solar Cells with Improved Light‐Induced Stability

Highly Efficient Solution‐Processed Poly(3,4‐ethylenedio‐xythiophene):Poly(styrenesulfonate)/Crystalline–Silicon Heterojunction Solar Cells with Improved Light‐Induced Stability

High‐Efficiency Panchromatic Hybrid Schottky Solar Cells

Transition metal oxides as hole-selective contacts in silicon heterojunctions solar cells

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