Development of hole transport transparent conductive electrodes for n-type crystalline silicon solar cells

Download

index.pdf

Date

2018

Author

Akdemir, Ozan

Metadata

Show full item record

Item Usage Stats

329
views

98
downloads

Conventional transparent conductive electrodes (TCEs) used in crystal silicon (c-Si) solar cells are commonly made of indium tin oxide (ITO) which provides low sheet resistance and high transparency. However, due to indium scarcity, ITO layers increase the fabrication cost; thus, alternative TCEs, such as fluorine-doped tin oxide (FTO), zinc oxide (ZnO), metal nanowires and Oxide/Metal/Oxide (OMO) multilayers, are being investigated. Conventional solar cells also make use of doped layers, to create the junction and back surface field that leads to several intrinsic losses such as parasitic absorption and doping related recombination. Dopant-free carrier selective contacts, that enable one type of carrier to pass while blocking the other type, are being studied as replacements of doped layers in c-Si solar cells. In this study, OMO multilayers with molybdenum oxide (MoOx), and silver (Ag) are formed via thermal evaporation as dopant-free hole transport transparent conductive electrodes (HTTCEs) for n-type c-Si solar cells. Semi-dopant-free c-Si cells, made from wafers with different doping concentrations that utilize OMO multilayers are compared in terms of solar cell performance. Comparison of two HTTCE design, optimizations of outer MoOx layer thickness and Ag deposition rates, and comparison of pyramid textured and flat surface solar cells are performed to increase optical and electrical properties. An efficiency of 9.3 ± 0.2 % is achieved with a pyramid textured semi-dopant-free solar cell that employs HTTCE structure. Results of this study can be used in research on dopant-free solar cells and any other photonic applications that require TCE layers.

Subject Keywords

Solar cells., Electrodes., Silicon solar cells., Molybdenum oxides.

URI

http://etd.lib.metu.edu.tr/upload/12622917/index.pdf
https://hdl.handle.net/11511/27887

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Fabrication of thin crystalline silicon solar cells with advanced light trapping Hadibrata, Wisnu; Yerci, Selçuk; Turan, Raşit; Department of Micro and Nanotechnology (2017) Thin crystalline silicon (c-Si) solar cells with thickness in the order of few tens of microns offer many attractive applications, such as, electronic wearables, space probes and satellites thanks to their flexibility and light-weight character. However, reducing the thickness of active layer of silicon solar cells leads to poor light absorption within the silicon layer, especially in the near infrared region of the solar spectrum. The poor absorption becomes problematic for thin c-Si solar cells as it caus...
Contact resistivity analysis of different passivation layers via transmission line method measurements Kökbudak, Gamze; Turan, Raşit; Yerci, Selçuk; Department of Micro and Nanotechnology (2017) Crystalline silicon (c-Si) homojunction solar cells constitute over 90% of the current photovoltaic market. Although the standard solar cells are cost effective and easy to process, their efficiency potential is unfortunately limited. Currently, more innovative cell concepts appeared with their high efficiency potential coupled with low costs. Since the recombination at surfaces and under metal contacts is one of the major obstacles against high conversion efficiencies, surface passivation has primary impor...
Imaging solar cells using terahertz waves Kayra, Seda; Altan, Hakan; Department of Physics (2011) In this thesis, Terahertz Time-Domain spectroscopy (THz-TDS) was used in order to measure the electrical properties of silicon solar cells. The advantage of THz-TDS is that it allows us to measure the electrical properties without electrical contacts. In order to perform these measurements, a reflection based system was constructed and the changes in the peak amplitude in the time-domain under a, 450mW 808 nm continuous wave laser source were measured. The solar cell that was used in this thesis was manufac...
Synthesis, electrochemical characterization and organic solar cell applications of selenophene containing conjugated polymers Yaşa, Mustafa; Toppare, Levent Kamil; Department of Polymer Science and Technology (2017) Donor-Acceptor (D-A) type conjugated polymers are very popular for potential applications such as organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistors. In literature, cyclopentadithiophene and its derivatives are commonly used electron donor units for organic solar cells. The incorporation of selenium atom into polymer backbone results in low band gap polymers as compared to sulfur and oxygen counterparts. In this study, selenophene containing conjugated po...
Three dimensional crystalline silicon solar cells Baytemir, Gülsen; Turan, Raşit; Department of Physics (2018) Three-dimensional crystalline silicon solar cells have been attracting attention with its remarkable electrical and optical performance. In this geometry, nano/micropillars allow minority carrier collection in the radial direction and shorten the path length of the photogenerated carriers. Furthermore, with appropriate geometry of the pillars the solar cell efficiency is enhanced due to the reduced surface reflectance and increased light harvesting. Throughout this study, metal assisted etching (MAE), a top...

Citation Formats

O. Akdemir, “Development of hole transport transparent conductive electrodes for n-type crystalline silicon solar cells,” M.S. - Master of Science, Middle East Technical University, 2018.