External quantum efficiency - Revision history

Cmditradmin: /* Operation */

2011-10-19T23:15:26Z

Operation

← Older revision		Revision as of 16:15, 19 October 2011
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	=== Operation ===		=== Operation ===
	~~EQE Part1~~		{{#ev:youtube\|PGq4xpnNuCs}}
	{{#ev:youtube\|~~zKagkC2n-rU~~}}

	~~EQE Part2~~
	~~{{#ev:youtube\|yxggrSciBnM}}~~

	Ideally the calibrated photodiode should be the same size as the illuminated area of the test sample. Otherwise even though the photodiode is masked to the same area as the test pixel there is the possibility of measuring dark currents from the remaining area of the photodiode.		Ideally the calibrated photodiode should be the same size as the illuminated area of the test sample. Otherwise even though the photodiode is masked to the same area as the test pixel there is the possibility of measuring dark currents from the remaining area of the photodiode.

Cmditradmin: /* Operation */

2011-07-28T15:43:19Z

Operation

← Older revision		Revision as of 08:43, 28 July 2011
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	[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]		[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]
	<br clear='all'>		<br clear='all'>
	[[http://depts.washington.edu/cmditr/mediawiki/images/5/55/EQE_calculation.xls Download EQE Excel worksheet]]		[http://depts.washington.edu/cmditr/mediawiki/images/5/55/EQE_calculation.xls Download EQE Excel worksheet]

	The spreadsheet columns are as follows.		The spreadsheet columns are as follows.

Cmditradmin: /* Operation */

2011-07-28T15:42:54Z

Operation

← Older revision		Revision as of 08:42, 28 July 2011
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	[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]		[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]
	<br clear='all'>		<br clear='all'>
	[[~~file~~://images/5/55/EQE_calculation.xls]]		[[http://depts.washington.edu/cmditr/mediawiki/images/5/55/EQE_calculation.xls Download EQE Excel worksheet]]

	The spreadsheet columns are as follows.		The spreadsheet columns are as follows.

Cmditradmin: /* Operation */

2011-07-28T15:39:33Z

Operation

← Older revision		Revision as of 08:39, 28 July 2011
Line 28:		Line 28:
	[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]		[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]
	<br clear='all'>		<br clear='all'>
	[[file://images/5/55/EQE_calculation.xls ~~Download Sample Spreadsheet.~~]]		[[file://images/5/55/EQE_calculation.xls]]

	The spreadsheet columns are as follows.		The spreadsheet columns are as follows.

Cmditradmin: /* Operation */

2011-07-28T15:38:42Z

Operation

← Older revision		Revision as of 08:38, 28 July 2011
Line 28:		Line 28:
	[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]		[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]
	<br clear='all'>		<br clear='all'>
	[~~http~~://images/5/55/EQE_calculation.xls Download Sample Spreadsheet.]		[[file://images/5/55/EQE_calculation.xls Download Sample Spreadsheet.]]

	The spreadsheet columns are as follows.		The spreadsheet columns are as follows.

Cmditradmin: /* Operation */

2011-07-28T15:35:59Z

Operation

← Older revision		Revision as of 08:35, 28 July 2011
Line 28:		Line 28:
	[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]		[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]
	<br clear='all'>		<br clear='all'>
	[/images/5/55/EQE_calculation.xls Download Sample Spreadsheet.]		[http://images/5/55/EQE_calculation.xls Download Sample Spreadsheet.]

	The spreadsheet columns are as follows.		The spreadsheet columns are as follows.

Cmditradmin: /* Operation */

2011-07-28T15:35:06Z

Operation

← Older revision		Revision as of 08:35, 28 July 2011
Line 28:		Line 28:
	[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]		[[Image:Excelcalc.png\|thumb\|500px\|Sample Excel EQE calculation]]
	<br clear='all'>		<br clear='all'>
	[~~http:~~//~~depts.washington.edu~~/~~cmditr/media~~/EQE_calculation.xls Download Sample Spreadsheet.]		[/images/5/55/EQE_calculation.xls Download Sample Spreadsheet.]

	The spreadsheet columns are as follows.		The spreadsheet columns are as follows.

Bradmac: /* Overview */

2010-06-18T02:19:27Z

Overview

← Older revision		Revision as of 19:19, 17 June 2010
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	=== Overview ===		=== Overview ===

	External Quantum Efficiency (EQE) for a photovoltaic device is the ~~number~~ of extracted free charge carriers ~~per~~ incident ~~photon~~. This ratio is obtained by measuring the photocurrent spectrum of the photovoltaic device under test and comparing it to the photocurrent spectrum of a calibrated photodetector, thereby removing the spectral characteristics of the test system. Relative and arbitrary unit EQE measurements can be obtained quite easily when care is taken to ensure similar test conditions for each device under test. Quantitatively accurate measurements require the user to pay attention to details such as illumination intensity and flux distribution of the light source[ref], optical reflectance and interference in device and test chamber[refs], device temperature[ref], and also the definition of the effective active area[ref]. With all of these considerations in addition to the variability of device fabrication protocol in different laboratories, the standardized power conversion efficiency measurement may make the best universal benchmark for device performance. However, the EQE measurement can be broken up into different spectral components and allows for the comparison and analysis of device physics.		External Quantum Efficiency (EQE) for a photovoltaic device is the ratio of extracted free charge carriers to incident photons. This ratio is obtained by measuring the photocurrent spectrum of the photovoltaic device under test and comparing it to the photocurrent spectrum of a calibrated reference photodetector, thereby removing the spectral characteristics of the test system. Relative and arbitrary unit EQE measurements can be obtained quite easily when care is taken to ensure similar test conditions for each device under test. Quantitatively accurate measurements require the user to pay attention to details such as illumination intensity and flux distribution of the light source[ref], optical reflectance and interference in device and test chamber[refs], device temperature[ref], and also the definition of the effective active area[ref]. With all of these considerations in addition to the variability of device fabrication protocol in different laboratories, the standardized power conversion efficiency measurement may make the best universal benchmark for device performance. However, the EQE measurement can be broken up into different spectral components and allows for the comparison and analysis of device physics.

	see Wikipedia [http://en.wikipedia.org/wiki/Quantum_efficiency External Quantum Efficiency]		see Wikipedia [http://en.wikipedia.org/wiki/Quantum_efficiency External Quantum Efficiency]

Cmditradmin: /* Operation */

2010-01-19T21:09:47Z

Operation

← Older revision		Revision as of 14:09, 19 January 2010
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	=== Operation ===		=== Operation ===
	{{#ev:youtube\|~~jGlF0qRYwmE~~}}		EQE Part1
	{{#ev:youtube\|~~LTFxmhsh6Mo~~}}		{{#ev:youtube\|zKagkC2n-rU}}

			EQE Part2
			{{#ev:youtube\|yxggrSciBnM}}

	Ideally the calibrated photodiode should be the same size as the illuminated area of the test sample. Otherwise even though the photodiode is masked to the same area as the test pixel there is the possibility of measuring dark currents from the remaining area of the photodiode.		Ideally the calibrated photodiode should be the same size as the illuminated area of the test sample. Otherwise even though the photodiode is masked to the same area as the test pixel there is the possibility of measuring dark currents from the remaining area of the photodiode.

Cmditradmin: /* Operation */

2010-01-06T21:16:37Z

Operation

← Older revision		Revision as of 14:16, 6 January 2010
Line 13:		Line 13:
	=== Operation ===		=== Operation ===
	{{#ev:youtube\|jGlF0qRYwmE}}		{{#ev:youtube\|jGlF0qRYwmE}}
	{{#ev:youtube\|~~jGlF0qRYwmE~~}}		{{#ev:youtube\|LTFxmhsh6Mo}}

	Ideally the calibrated photodiode should be the same size as the illuminated area of the test sample. Otherwise even though the photodiode is masked to the same area as the test pixel there is the possibility of measuring dark currents from the remaining area of the photodiode.		Ideally the calibrated photodiode should be the same size as the illuminated area of the test sample. Otherwise even though the photodiode is masked to the same area as the test pixel there is the possibility of measuring dark currents from the remaining area of the photodiode.