Abstract
In this study, we applied a metal catalyst etching method to fabricate a nano/microhole array on a Si substrate for application in solar cells. In addition, the surface of an undesigned area was etched because of the attachment of metal nanoparticles that is dissociated in a solution. The nano/microhole array exhibited low specular reflectance (<1%) without antireflection coating because of its rough surface. The solar spectrum related total reflection was approximately 9%. A fabricated solar cell with a 40-μm hole spacing exhibited an efficiency of 9.02%. Comparing to the solar cell made by polished Si, the external quantum efficiency for solar cell with 30 s etching time was increased by 16.7%.
Highlights
Previous studies have reported that nanostructure surfaces can efficiently couple incident light into semiconductors [1-3]
A solar cell was manufactured using this structure to demonstrate the possibility of attaining high efficiency
The specular optical reflectance on nano/microhole arrays with various spacings was measured at a wavelength of 300 to 800 nm
Summary
Previous studies have reported that nanostructure surfaces can efficiently couple incident light into semiconductors [1-3]. Efficient light harvesting is vital for solar cells [4,5]. In addition to light coupling, efficient carrier transport in a nanowire structure has been suggested to increase the short-circuit current [6-8]. Several studies on solar cells have employed nanostructures to enhance performance [9-15]. A conducting polymer was adopted because it filled the space between nanostructures, enabling high efficiency to be achieved [15]. We propose a microhole array structure to facilitate fabrication by implementing metal catalyst etching. The optical reflectance of nano/microhole arrays with various spacings was evaluated. A solar cell was manufactured using this structure to demonstrate the possibility of attaining high efficiency
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