High efficiency hybrid PEDOT:PSS/nanostructured silicon Schottky junction solar cells by doping-free rear contact

Zhang, Yunfang; Cui, Wei; Zhu, Yawen; Zu, Fengshuo; Liao, Liang‐Sheng; Lee, Shuit‐Tong; Sun, Baoquan

doi:10.1039/c4ee02282c

Cited by 217 publications

(168 citation statements)

References 41 publications

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“…Several kinds of organic materials, including conjugated polymers [1][2][3][4]8], conjugated small molecules [9,10], and fullerene derivatives [11], are used as hole or electron transporting layer in hybrid solar cells. Among them, poly (3,4-ethylenedioxythiophene): polystyrene (PED-OT:PSS), a conducting polymer widely used as a hole transporting layer or metal-free electrode in organic electronic devices, has been proven to be commendable to act as a hole transporting layer in hybrid solar cells [12][13][14][15]. Owing to the rapid development of theory and techniques on high-performance materials [16,17], hybrid solar cells have gained great progress.…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive PEDOT:PSS Transparent Hole Transporting Layer with Solvent Treatment for High Performance Silicon/Organic Hybrid Solar Cells

Yang

Chen

et al. 2017

Nanoscale Res Lett

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Efficient Si/organic hybrid solar cells were fabricated with dimethyl sulfoxide (DMSO) and surfactant-doped poly(3,4-ethylenedioxythiophene): polystyrene (PEDOT:PSS). A post-treatment on PEDOT:PSS films with polar solvent was performed to increase the device performance. We found that the performance of hybrid solar cells increase with the polarity of solvent. A high conductivity of 1105 S cm − 1 of PEDOT:PSS was achieved by adopting methanol treatment, and the best efficiency of corresponding hybrid solar cells reaches 12.22%. X-ray photoelectron spectroscopy (XPS) and RAMAN spectroscopy were utilized to conform to component changes of PEDOT:PSS films after solvent treatment. It was found that the removal of the insulator PSS from the film and the conformational changes are the determinants for the device performance enhancement. Electrochemical impedance spectroscopy (EIS) was used to investigate the recombination resistance and capacitance of methanol-treated and untreated hybrid solar cells, indicating that methanol-treated devices had a larger recombination resistance and capacitance. Our findings bring a simple and efficient way for improving the performance of hybrid solar cell.

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Section: Introductionmentioning

confidence: 99%

Highly Conductive PEDOT:PSS Transparent Hole Transporting Layer with Solvent Treatment for High Performance Silicon/Organic Hybrid Solar Cells

Yang

Chen

et al. 2017

Nanoscale Res Lett

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“…Also low work function materials were applied as electron contacts leading to 20.5 % efficiency for TiO x [12] with a diffused hole contact, 14 % efficiency for Cs 2 CO 3 with a PEDOT:pss hole contact [13] and 19.4 % efficiency with a lithium floride electron contact and a molybdenum oxide hole contact deposited on (i)a-Si:H passivation layers [14].…”

mentioning

confidence: 99%

Oxygen vacancies in tungsten oxide and their influence on tungsten oxide/silicon heterojunction solar cells

Mews

Korte

Rech

2016

Solar Energy Materials and Solar Cells

147

105

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Tungsten oxide (WO x ) can be incorporated into amorphous/crystalline silicon heterojunction solar cells as hole contact and for interface modification between p-type amorphous silicon and indium tin oxide. This paper aims at understanding the influence of tungsten oxides properties on silicon heterojunction solar cells. Using in-system photoelectron spectroscopy on thermally evaporated WO x layers, it was verified that WO x with a stoichiometry close to WO 3 features a work function close to 6 eV and is therefore suitable as hole contact on silicon. Additionally the oxygen vacancy concentration in WO x was measured using photoelectron spectroscopy. High oxygen vacancy concentrations in WO x lead to a low band bending in the WO x /silicon-junction. Furthermore solar cells were fabricated using the same WO x , and the band bending in these cells is correlated with their fill factors (FF) and open circuit voltages (V OC ).Combining these results, the following picture arises: Positively charged oxygen vacancies raise the Fermi-level in WO x and reduce the band bending at the WO x /silicon-junction. This, in turn, leads to reduced V OC and FF. Thus, when incorporating WO x into silicon solar cells it is important to minimize the oxygen vacancy density in WO x . Therefore deposition methods, enabling adjustment of the WO x stoichiometry are preferable.

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“…For instance, In/Ga alloys with a work function of 4.08-4.25 eV [31][32][33][34], which is similar to work function of Al, might be effective as an alternative to Al because they have low ionization tendencies as compared to Al. Regarding the further improvement of the PCE of our hybrid solar cells using a Al rear electrode, the formation of the BSF regions consisting of a heavily-doped n + layer at the Si back surface/rear electrode interface [29,35] in order to prevent the ingress of holes toward trap levels at the interface regions, and the insertion of a hole-injection (and electron-blocking) layer at the PEDOT:PSS/front electrode interface [13] and/or an electron-injection (and hole-blocking) layer at the Si back surface/rear electrode interface [36] in order to reduce barrier height might be effective in enhancing the carrier transfer efficiency from the Si/PEDOT:PSS regions to each electrode. Introducing these approaches for our hybrid solar cells has the potential to acquire the cell performance comparable to the Si nanowire/PEDOT:PSS hybrid solar cells with high PCE of more than 11%.…”

Section: Effect Of Rear Electrode Of Si/pedot:pss Hybrid Solar Cells mentioning

confidence: 99%

Improved Separation and Collection of Charge Carriers in Micro-Pyramidal-Structured Silicon/PEDOT:PSS Hybrid Solar Cells

et al. 2017

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Silicon (Si)/organic polymer hybrid solar cells have great potential for becoming cost-effective and efficient energy-harvesting devices. We report herein on the effects of polymer coverage and the rear electrode on the device performance of Si/poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) hybrid solar cells with micro-pyramidal structures. These hybrid solar cells provided adequate generation of charge carriers owing to the suppression of reflectance to below 13%. Additionally, the separation of the photogenerated charge carriers at the micro-pyramidal-structured Si/PEDOT:PSS interface regions and their collection at the electrodes were dramatically improved by tuning the adhesion areas of the PEDOT:PSS layer and the rear electrode materials, thereby attaining a power conversion efficiency of 8.25%. These findings suggest that it is important to control the PEDOT:PSS coverage and to optimize the rear electrode materials in order to achieve highly efficient separation of the charge carriers and their effective collection in micro-textured hybrid solar cells.

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High efficiency hybrid PEDOT:PSS/nanostructured silicon Schottky junction solar cells by doping-free rear contact

Abstract: An excellent PCE of 13.7% has been achieved by inserting a solution processed Cs2CO3 layer between nanostructured Si and Al.

Cited by 217 publications

References 41 publications

Highly Conductive PEDOT:PSS Transparent Hole Transporting Layer with Solvent Treatment for High Performance Silicon/Organic Hybrid Solar Cells

Highly Conductive PEDOT:PSS Transparent Hole Transporting Layer with Solvent Treatment for High Performance Silicon/Organic Hybrid Solar Cells

Oxygen vacancies in tungsten oxide and their influence on tungsten oxide/silicon heterojunction solar cells

Improved Separation and Collection of Charge Carriers in Micro-Pyramidal-Structured Silicon/PEDOT:PSS Hybrid Solar Cells

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