Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Surface preparation passivation and patterning techniques used in silicon based heterojunction solar cells
Download
index.pdf
Date
2017
Author
Dönerçark, Ergi
Metadata
Show full item record
Item Usage Stats
296
views
132
downloads
Cite This
For silicon Heterojunction (SHJ) solar cell technology features, a thin intrinsic hydrogenated amorphous silicon (i a-Si:H) layer has inserted between the crystalline silicon and doped amorphous silicon. The state of the art SHJ solar cell structure involves low temperature depositions of a-Si:H layer by means of Plasma Enhanced Chemical Vapor Deposition (PECVD) technique. Recent developments on SHJ solar cells have been focused on increasing the passivation quality of a-Si:H layer and the formation of all metal contacts on the rear side. In this thesis, the motivation is to achieve high efficiency SHJ solar cells by improving the surface passivation properties of thin a-Si:H film together with the integration of interdigitated back contact (IBC) concept. In this study, several surface preparation techniques including wet chemical chemistry were implemented to solar cell fabrication sequence. The wet chemical processes were optimized to reach the required surface cleanness appropriate for device applications. Additionally, the effects of the pyramid edge rounding process were investigated on the optical and electrical properties of the solar cell. Then, the deposition parameters of i a-Si:H were optimized to enhance surface passivation. Furthermore, the optimum post-annealing treatment parameters were determined to improve the sputtering induced damages. Consequently, the highest efficiency was recorded as 12.5% and 15.8% for the samples with the cell area of 4 cm2 and 0.9 cm2, respectively. In addition, a novel wet chemical etching approach for emitter patterning was utilized in the fabrication of SHJ IBC solar cell. Moreover, for the emitter etching process, the optimized wet chemical chemistry and application conditions were demonstrated in term of the passivation quality of the etched areas. The passivation quality of a-Si:H/silicon nitride (SiNX) stack layer was also investigated as a front surface passivation and antireflection layer by combining with the etching method in SHJ IBC fabrication sequence. As a result of the successful application of the optimized process parameters, the production of 18% efficient SHJ IBC solar cells was realized without any surface texturing.
Subject Keywords
Solar cells.
,
Hydrogenation.
,
Photovoltaic cells.
,
Amorphous substances.
URI
http://etd.lib.metu.edu.tr/upload/12620740/index.pdf
https://hdl.handle.net/11511/26241
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
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...
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...
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...
Development of hole transport transparent conductive electrodes for n-type crystalline silicon solar cells
Akdemir, Ozan; Bek, Alpan; İmer, Muhsine Bilge; Department of Micro and Nanotechnology (2018)
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 junc...
Structuring of surface for light management in monocrystalline Si solar cells
Bilgen, Sedat; Turan, Raşit; Department of Physics (2015)
Texturing of a silicon wafer is the first process of production of screen printed solar cells to reduce the reflection losses by producing pyramids on the surface of the silicon wafer. Being a cheap and time efficient process, texturing is used in all industrial applications. For mono-crystalline silicon wafers, the process is carried out by using an alkaline solution which consists of potassium hydroxide (KOH), isopropyl alcohol (IPA) and de-ionized water (DI-water) which is heated to 75- 80oC, and wafers ...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
E. Dönerçark, “Surface preparation passivation and patterning techniques used in silicon based heterojunction solar cells,” M.S. - Master of Science, Middle East Technical University, 2017.