Dissertation > Excellent graduate degree dissertation topics show

Passivation of Silicon Solar Cells by Anodic Oxidation Method

Author: WenDuZi
Tutor: LiuWeiFeng
School: Dalian University of Technology
Course: Microelectronics and Solid State Electronics
Keywords: Silicon Dioxide Passivation Solar cells Electrochemical Anodic oxidation
CLC: TM914.4
Type: Master's thesis
Year: 2013
Downloads: 12
Quote: 0
Read: Download Dissertation

Abstract


Passivation is one of the important reasons that effect the efficiency of solar cells, The passivation method commonly used in the industrial production is high temperature thermally grown silicon dioxide and a plasma enhanced chemical vapor deposition (PECVD) of silicon nitride (SiNx). But the lattice mismatch in SiNx/Si surface cause the higher interface defect density and decrease the effective minority carrier lifetime. Reasons for the high cost, thermal silica didn’t obtain a wide range of applications. The silica also can grow by electrochemical methods, this process is low-temperature process and easily grown on a rough surface, etc., so how to improve the interface characteristics of electrochemically grown SiO2/Si is particularly important.In this paper, silicon dioxide passivation layer was grown by electrochemical method using nitric acid solution on the p-type silicon. Surface morphology observed by SEM photo. High-frequency capacitance voltage (C-V) and surface photovoltaic (SPV) technology were used to analysis the SiO2/Si interface characteristics and the photo-generated minority carriers recombination process in the different growth and annealing conditions. It was found that a low voltage (10V), high concentration solution (3mol/L), short time(20minutes) and high-temperature annealing (500℃) can obtain better SiO2/Si interface characteristics and can slow down the photo induced minority carrier recombination velocity. Analysis found that: interface state and charge controlled by tunneling current, the rate of oxidation, the content of water in the solution and annealing temperature. The tunneling current can easily produce negatively charged center and tunneling current also can generate a new interface state. The oxidation rate controlled by the water content in the solution, high oxidation rate will lead to non-uniform oxide film thus more interface states generated. After annealing in lower temperature, positive charge reduced and interface defect state does not changed, thereby speeding up the photo generated minority carrier recombination. Both surface states and positive fixed charges decreased when the annealing temperature arrives at500℃, but the surface states were decreased significantly. Then minority carriers’ recombination velocity was decreased.

Related Dissertations

  1. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  2. Electrochemical Studies on Interaction between ApoCopC、BSA and Cu(Ⅱ)、Cu(Ⅰ)、Cd(Ⅱ)、Ag(Ⅰ),O646
  3. Synthesis and Photovoltaic Properties of Low-bandgap Polymers Based on N-arylcarbazole,O626.2
  4. Research on Chemical Passivation of Single-crystalline Germanium,O614.431
  5. Study of the Preparation and Properties of the Trivalent Chromium Black Passivation with Non-cobalt Sulfate System,TG174.4
  6. The Tin Coating Discoloration and Solderability Study in Lead Frame,TN305
  7. Research to Prevent the Rehydration of Lime,TF769
  8. The Fabrication and Research of the Chemically Modified Electrode in the Detection of Water and Saccharide Content,X832
  9. Research and Design of Solar Cells Tester Based on Embedded Technology,TM914.4
  10. Preparation and Modification of Lithium Manganese Phosphate Cathode Material for Lithium-ion Battery,TM912
  11. Electrochemical Detection of COD and Triclosan Based on the Enhancement Effect of Nano-Cu and Carbon Nanotubes,X832
  12. Heavy metal line monitor hardware design and testing laboratories,X832
  13. Mg-Ni-La bulk metallic glass systems and hydrogen storage properties of crystallization,TG139.8
  14. The Preparation and Electrochemical Tests of Carbon Foam,O613.71
  15. NiTi shape memory alloy Laser Reactive Synthesis of porous coating,TG178
  16. Polymer solar cell structure design and performance optimization,TM914.4
  17. Amino silicone microemulsion electrochemical wastewater pretreatment technology research,X703.1
  18. Mixing two shape-selective cracking of cumene,TQ244.2
  19. DC corona discharge based on oxidation / reduction atmosphere electrochemical behavior of free radicals,X703
  20. Photocatalytic Reduction of Nitrate on Metal Modified TiO2,X703
  21. Magnesium alloy surface MoS2 / resin hybrid layer Preparation and Properties,TG174.4

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
© 2012 www.DissertationTopic.Net  Mobile