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- 저자 : Nima Taghavinia (검색결과 4 건)
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A modeling study on utilizing SnS<sub>2</sub> as the buffer layer of CZT(S, Se) solar cells
Haghighi, Maryam,Minbashi, Mehran,Taghavinia, Nima,Kim, Dae-Hwan,Mahdavi, Seyed Mohammad,Kordbacheh, Amirhossein Ahmadkhan Elsevier 2018 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.167 No.-
<P><B>Abstract</B></P> <P>CdS is conventionally used as the n-type buffer layer in chalcopyrite (CIG(S, Se)) and Kesterite (CZT(S, Se)) solar cells. CdS is toxic and there are wide attempts to find substitutes for it. Here, we suggest SnS<SUB>2</SUB> as a possible alternative. SnS<SUB>2</SUB> films were deposited by pulsed laser deposition (PLD), characterized to estimate carrier concentration and electron affinity values, and the obtained values were used to model a CZT(S, Se) solar cell. The experimental values of a benchmark CZT(S, Se) cell with efficiency of 12.3% were employed to obtain the density and energy position of defects in CZT(S, Se) and validating the model. We observed that SnS<SUB>2</SUB> results in almost identical performance as CdS, showing slightly better current density, due to smaller conduction band offset of 0.21 eV compared to 0.28 eV for CdS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CZT(S, Se) solar cell is modeled with vertically graded absorber composition based on experimental data. </LI> <LI> The non-toxic and inexpensive SnS<SUB>2</SUB> has been introduced as a new buffer layer and appropriate alternative for CdS. </LI> <LI> The measured conduction and valence band positions of PLD grown SnS<SUB>2</SUB> layers are 4.26 eV and 6.11 eV. </LI> <LI> SnS<SUB>2</SUB> compares well with CdS as the buffer layer of CZT(S, Se) solar cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Golnaz Sadoughi,Raheleh Mohammadpour,Azam Iraji zad,Nima Taghavinia,Shabnam Dadgostar,Mahmoud Samadpour,Fariba Tajabadi 한국물리학회 2013 Current Applied Physics Vol.13 No.2
The photoanodes of solid state dye sensitized solar cells (ss-DSCs) embedded with different contents of TiO2 hollow spheres (HSs) were prepared and the photovoltaic performances were systematically characterized. TiO2 hollow spheres were synthesized by a facile sacrificial templating method, grounded and added in different ratios to TiO2 nanoparticle (NP) paste, from which composite HS/NP electrodes were fabricated. The composite photoanodes include hollow spheres of 300e700 nm with enhanced light scattering characteristics in visible range which leads to improved light absorption in conventional thin film electrodes of ss-DSC. By optimizing the amount of HSs in the paste, 40% improvement in efficiency was obtained in comparison to ss-DSC utilized pure NP electrodes. By increasing the fraction of HSs in the electrode the current density increased by 56% (from 2.5 to 3.9 mA cm2). The improved photovoltaic performance of ss-DSC is primarily due to different morphology and altered charged trap distribution in HSs in comparison to NP which leads to significant enhancement in electron transport time and electron lifetime as well as charge collection efficiency and light absorption properties.
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Masoud Karimipour,Sara Mashhoun,Mohsen Mollaei,Mehdi Molaei,Nima Taghavinia 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
TiO2 nanotubes were synthesized using a modified autoclave-free thermal method from as-prepared initial powders. The size of initial powders (IP) was found to be critical in determining the morphology and crystal structure of the final product. Oleylamine (OA) was used as the polymer agent in the preparation of initial powders with different mol ratios of OA/Ti: 1, 5, and 10. X-ray diffraction analysis depicted that the increase of mole ratio up to 10 resulted in smaller nanoparticles with the sizes of about 8 nm. It was also deliberated that low temperature thermally treated IP showed the characteristic diffraction pattern of titanate phase of nanotubes. Scanning electron microscope images showed nanorods, short nanotubes, and single-phase long and uniform nanofibers produced from initial powders. SEM cross-section of the anode cell of TiO2 nanofibers demonstrated the presence of uniformly closed net long fibers in the cell. Open circuit voltage measurements of the nanofiber cell demonstrated a several hundreds of seconds in the electron transport decay, which was significantly higher than that of the nanoparticles. IMPS/IMVS measurements of the nanofibers and nanotube solar cells showed electron transport enhancement and long life time compared to their nanoparticle counterparts.
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Rouhollah Khosroshahi,Nastaran A. Tehrani,Mozhdeh Forouzandeh,Fatemeh Behrouznejad,Nima Taghavinia,Mojtaba Bagherzadeh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
In this work, synthesis of CuIn0.75Ga0.25S2 (CIGS) nanoparticles, the formation of stable dispersion, depositionof high-quality films and, fabrication of thin-film Perovskite solar cells are reported. The stability ofnanoparticle ink is crucial in the formation of device-quality films. The chalcogenide-based materials arewidely used in thin-film solar cells; in particular, Cu(In,Ga)S2 are used as an absorber and hole transportinglayer. In the present study, the nanoparticles of about 20 nm size and bandgap of 1.5 eV are synthesizedusing a heat-up method. A variety of solvents are used as dispersing media and the stability of theinks is evaluated by precise optical monitoring. We observe a clear dependence of ink stability to thepolarity index of the solvent, where the best stability occurs at a polarity index of about 0.26–0.36, correspondingto a range of solvents including chloroform. The thin films that are spin-coated using CIGSchloroform ink show large cracks, presumably due to the high vapor pressure of chloroform andevaporation-induced stress in the film. We resolve this problem through low-temperature deposition,which resulted in highly uniform pin-hole and crack-free films. Finally, the optimum deposition conditionis used to fabricate perovskite solar cells having about 16.5% efficiency with CIGS as a hole transportlayer.
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