Low temperature fabrication of PEDOT:PSS/micro-textured silicon-based heterojunction solar cells

Yameen, Mohammad; Srivastava, Sanjay K.; Turan, Kamini; Prathap, P.; Vandana, .; Rauthan, C. M. S.; Singh, Prashant

doi:10.1007/s10853-015-9372-7

Cited by 32 publications

(15 citation statements)

References 37 publications

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“…Improving optical and electrical properties by applying additives into PEDOT:PSS film would enhance the performance of solar cells. A “secondary doping” method is used to enhance the conductivity of the organic layer by adding dimethylsulfoxide (DMSO) to PEDOT:PSS compound [ 23 ]. The electrical conductivity of PEDOT:PSS solution can be greatly increased by adding extra DMSO of 5 wt.% [ 10 , 23 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

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High Performance of PEDOT:PSS/n-Si Solar Cells Based on Textured Surface with AgNWs Electrodes

et al. 2018

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Hybrid heterojunction solar cells (HHSCs) have gained extensive research and attention due to simple device structure and low-cost technological processes. Here, HHSCs are presented based on a highly transparent conductive polymer poly(3,4ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS) directly spin-coated on an n-type crystalline silicon with microscale surface textures, which are prepared by traditional chemical etching. We have studied interface properties between PEDOT:PSS and textured n-Si by varying coating conditions. Final power conversion efficiency (PCE) could arrive at 8.54% by these simple solution-based fabrication processes. The high conversion efficiency is attributed to the fully conformal contact between PEDOT:PSS film and textured silicon. Furthermore, the reflectance of the PEDOT:PSS layer on textured surface is analyzed by changing film thickness. In order to improve the performance of the device, silver nanowires were employed as electrodes because of its better optical transmittance and electrical conductivity. The highest PCE of 11.07% was achieved which displayed a 29.6% enhancement compared with traditional silver electrodes. These findings imply that the combination of PEDOT:PSS film and silver nanowire transparent electrodes pave a promising way for realizing high-efficiency and low-cost solar cells.

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Section: Resultsmentioning

confidence: 99%

“…A thinner film would cause the direct connection between metal electrodes and top of pyramids. Meanwhile, due to the decreased film thickness, the decreased length of P-N junction has an effect on the device performance [ 23 ]. And, the nonuniformity of film thickness at 8000 rpm may be especially important on influencing device efficiency.…”

Section: Resultsmentioning

confidence: 99%

High Performance of PEDOT:PSS/n-Si Solar Cells Based on Textured Surface with AgNWs Electrodes

et al. 2018

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“…Theoretically, these hybrid solar cells (HSCs) have potential to achieve comparable efficiency to a conventional Si homojunction solar cell as light absorption and photocarrier generation in such HSCs take place in the Si wafer only . Most commonly, an inexpensive, highly conducting, and transparent polymer, namely, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), which acts as a p-layer (carrier-selective hole transport), is coated over n-type crystalline Si surfaces − resulting into a Schottky junction at the PEDOT:PSS/Si interface. , PEDOT:PSS is widely used as a hole-transporting layer or a metal-free electrode in organic electronic devices. , The polystyrene sulfonate (PSS) is used as primary dopant to enable suspension in water and to better facilitate its widespread usage as PEDOT:PSS is highly stable . Moreover, the conductivity of PEDOT:PSS can be tailored (up to as high as 1000 S/cm) by adding suitable co-solvents, for example, dimethyl sulfoxide (DMSO), N , N -dimethyl formamide, glycerol, sorbitol, ethylene glycol (EG), and so forth. − PEDOT:PSS is suggested to play four vital roles in such HSCs, that is, (i) it induces an inversion layer in n-Si (i.e., a p-dopant-free, Si p–n junction is formed) to block electrons and extract holes, (ii) it transports holes to the metal anode, (iii) it acts as a surface passivation layer to reduce interfacial recombination, and (iv) it increases light harvesting by reducing reflection losses.…”

Section: Introductionmentioning

confidence: 99%

“…The PEDOT:PSS/Si HSCs, therefore, have attracted a lot of attention over the past few years, and considerable progress toward efficient HSCs has been achieved. Different Si surface schemes like planar and micropyramidal and various nanostructured Si such as nanowires arrays, nanoholes, nanocones, hierarchically textured Si, and so forth have been used for the HSCs. ,,,,,− A comparative review on the PEDOT:PSS/Si HSCs employing different Si surfaces is presented in our earlier work comparing the best cells’ parameters, their device structures, and special features (materials, process, and device parameters) employed to achieve the best performances . Through extensive optimization of the property of the PEDOT:PSS film, PEDOT:PSS/Si heterointerface, and Si/rear electrode contact, the HSCs have achieved an efficiency >16%. , However, it may be noted that >10% efficient HSCs have been achieved only via employing advance cell structures like the back surface field (BSF), additional antireflection coating (ARC), various kinds of high-end surfactants in PEDOT:PSS, Si surface treatments, and front/rear passivation schemes for better polymer/Si interface and electrical responses, in addition to playing with factors such as electrical conductivity, chemical affinity, interfacial layers, and so forth in the different device designs (8, 21, 22, 25, and references in Table S1).…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient PEDOT:PSS/Silicon Hybrid Solar Cells via Effective Surface Microengineering of Low-Cost Solar-Grade Silicon Wafers

Srivastava

Sharma

Kumari

et al. 2021

ACS Appl. Energy Mater.

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The organic carrier-selective layer, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) coated on Si wafers, has attracted a lot of attention toward the development of low-cost and efficient hybrid solar cells (HSCs). Here, highly efficient PEDOT:PSS/Si HSCs are reported via an effective surface microengineering of the as-cut, low-cost solar-grade thin Si wafers, an aspect rarely addressed before, by a simple one-step aqueous KOH process. The influence of surface microstructuring on their light harvesting properties, polymer/Si junction formation, and photovoltaic (PV) performance of the PEDOT:PSS/Si HSCs are investigated. The simple one-step process under the optimized processing conditions reduces the weighted surface reflectivity from >35 to <9% in a broad spectral range in addition to removing the surface saw damages of the wafers completely. The combined effect in turn improves the PEDOT:PSS/Si interface (junction) property, leading to a highly efficient PEDOT:PSS/Si HSC even in its simplest possible device structure. Moreover, the antireflective and surface passivation properties of the PEDOT:PSS layer for the microstructured Si surfaces are also demonstrated. The optimized microsurface and cell processing conditions resulted in the HSCs with a photoconversion efficiency >12.25%, which is absolute ∼9.70% (∼5 folds) higher when compared to that on starting non-structured Si wafers. The results are further supported by detailed dark J–V characteristics and quantum efficiency analysis of the devices. The study establishes that microengineering of the commercial as-cut Si wafers removes the surface damages on both sides which if not addressed properly cause very high surface recombination losses and have a detrimental effect on the polymer/Si junction and hence the PV performances. The study paves the way to develop simple yet efficient HSCs on such economic solar-grade Si wafers commonly used for the conventional Si solar cells.

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“…In the past decade, organic–silicon (Si) hybrid heterojunction solar cells, which combine the solution processability of the organic component and the excellent electronic property and wide absorption range of Si, have been widely explored . The most commonly used organic component is a water‐soluble conductive polymer, poly(3,4‐ethylenedioxythiophene): polystyrene (PEDOT:PSS), as it can provide a hole transport layer (HTL) with sufficient optical transparency, effective hole extraction, and good surface passivation . Oftentimes the PEDOT:PSS layer is solution‐casted on the surface of the silicon nanostructure to form a front‐junction solar cell configuration.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Silicon‐Based Heterojunction Solar Cells with Double Hole‐Transporting Layers

Shen

Zhang

Zhou

et al. 2018

Adv Elect Materials

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Hybrid nanostructured silicon–organic solar cells have been pursued as a low‐cost solution for silicon photovoltaic devices. However, it is difficult for the organic semiconductor, typically poly(3,4‐ethylenedioxythiophene):polystyrene (PEDOT:PSS), to fully cover the nanostructured silicon surface due to the high surface tension of the polymer solution and the small size of the cavities in nanostructured silicon. As a result, the performance of the hybrid solar cells is limited by the defect‐induced surface recombination and poor hole extraction. In this work, an inorganic hole‐transporting layer, copper(I) thiocyanate (CuSCN), is introduced between silicon nanowire (SiNW) and PEDOT:PSS to improve the junction quality. The effect of CuSCN on as‐fabricated SiNW and tetramethylammonium hydroxide (TMAH)‐treated SiNW structures is examined, and it is shown that in both cases CuSCN can well cover the SiNW surface due to the easy penetration of its solution into the silicon nanostructure. As a result, the power conversion efficiency of the solar cells has been dramatically improved from 7.68% to 10.5% for as‐fabricated SiNW‐based‐hybrid cells, and from 10.75% to 12.24% for TMAH‐passivated SiNW‐based‐hybrid cells, suggesting that the double hole‐transporting layer approach can effectively improve the junction quality in hybrid organic‐nanostructured silicon‐based devices.

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Low temperature fabrication of PEDOT:PSS/micro-textured silicon-based heterojunction solar cells

Cited by 32 publications

References 37 publications

High Performance of PEDOT:PSS/n-Si Solar Cells Based on Textured Surface with AgNWs Electrodes

High Performance of PEDOT:PSS/n-Si Solar Cells Based on Textured Surface with AgNWs Electrodes

Highly Efficient PEDOT:PSS/Silicon Hybrid Solar Cells via Effective Surface Microengineering of Low-Cost Solar-Grade Silicon Wafers

Nanostructured Silicon‐Based Heterojunction Solar Cells with Double Hole‐Transporting Layers

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