Interface electric properties of Si/organic hybrid solar cells using impedance spectroscopy analysis

The accurate determination of the electrical properties of photovoltaic devices is of utmost importance to predict and optimize their overall optoelectronic performance. For example, the minority carrier lifetime and the carrier diffusion length have a strong relationship with the carrier recombination rate. Additionally, parasitic resistances have an important effect on the fill factor of a solar cell. Within this context, the alternating current (AC) and direct current (DC) electrical characteristics of Si-based metal–insulator–semiconductor (MIS) Schottky barrier diodes with the basic structure Al/Si/TiO2/NiCr were studied, aiming at using them as photovoltaic devices. The basic diode structure was modified by adding nanostructured porous silicon (nanoPS) layers and by infiltrating silver nanoparticles (AgNPs) into the nanoPS layers, leading to Al/Si+nanoPS/TiO2/NiCr and Al/Si+nanoPS+AgNPs/TiO2/NiCr structures, respectively. The AC electrical properties were studied using a combination of electrochemical impedance spectroscopy and Mott–Schottky analysis, while the DC electrical properties were determined from current–voltage measurements. From the experimental results, an AC equivalent circuit model was proposed for the three different MIS Schottky barrier diodes under study. Additionally, the most significant electrical parameters were calculated. The results show a remarkable improvement in the performance of the MIS Schottky barrier diodes upon the addition of hybrid nanoPS layers with embedded Ag nanoparticles, opening the way to their use as photovoltaic devices.

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“…The minority carrier lifetime (τ) for every interface can be obtained from the well-known relationship [33]:…”

Section: Ac Electrical Measurementsmentioning

confidence: 99%

Electrical Characterization of MIS Schottky Barrier Diodes Based on Nanostructured Porous Silicon and Silver Nanoparticles with Applications in Solar Cells

Ramadan

Martín-Palma

2020

Energies

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“…The surface roughness estimated from AFM for the untreated PEDOT:PSS film is 2.08 nm and 2.38 nm for the treated film. Impedance spectroscopy measurement is a powerful technique to probe the physical processes, such as carrier transfer and recombination at internal interfaces, using a proper RC element [34,35]. MottSchottky (MS) curves were also measured for methanol-treated and untreated hybrid solar cells.…”

Section: Conductivity and Optoelectronic Properties Of Treated Pedot:mentioning

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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“…The improved R s contributes to the enhanced FF. The minority carrier lifetime ( τ ) can be obtained from the following equation:

τ = R_{P} \times C

…”

Section: Pv Performance Parameters Of Hybrid Solar Cells With 0 5 Nmmentioning

confidence: 99%

Hafnium Thin Film as a Rear Metallization Scheme for Polymer/Silicon Hybrid Solar Cells

Yang

Chen

et al. 2018

Physica Rapid Research Ltrs

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In this work, a hafnium (Hf) thin film is introduced for the first time as the rear metallization scheme between the rear side of n‐type crystalline silicon (n‐Si) and Ag electrode in the poly (3, 4‐ethylenedioxythiophene) doped with poly (styrenesulfonate) (PEDOT:PSS) polymer/Si hybrid solar cell. Hf thin films are uniformly deposited at room temperature by sputtering technology, showing its advantages of stable electrical sheet resistance at the atmosphere with the relative humidity of 40%. The insertion of Hf thin film reduced interfacial carrier recombination and contact resistance loss, leading to a significant improvement in the open circuit voltage (Voc) and the fill factor (FF) of the polymer/Si hybrid solar cell. Eventually, compared with the reference device (only Ag back metallization), a higher power conversion efficiency (PCE) is obtained. This efficacy could be attributed to low work function of Hf thin film to ensure the highly transparent to electrons at the rear side of the hybrid solar cell.

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Interface electric properties of Si/organic hybrid solar cells using impedance spectroscopy analysis

Cited by 29 publications

References 26 publications

Electrical Characterization of MIS Schottky Barrier Diodes Based on Nanostructured Porous Silicon and Silver Nanoparticles with Applications in Solar Cells

Electrical Characterization of MIS Schottky Barrier Diodes Based on Nanostructured Porous Silicon and Silver Nanoparticles with Applications in Solar Cells

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

Hafnium Thin Film as a Rear Metallization Scheme for Polymer/Silicon Hybrid Solar Cells

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