Pointon, A. I., Grant, Nicholas E., Wheeler-Jones, Evé, Altermatt, P. P. and Murphy, John D. (2018) Data for Superacid-derived surface passivation for measurement of ultra-long lifetimes in silicon photovoltaic materials. [Dataset]

	Plain Text (Readme describes data in .XLSX file) readme.txt - Supplemental Material Available under License Creative Commons Attribution 4.0. Download (729b)
	Microsoft Excel (Data for figures. The data behind all the graphs presented in the paper. Each worksheet within the file relates to a single figure in the paper. ) 2018-03-15 Dataset for WRAP.xlsx - Published Version Available under License Creative Commons Attribution 4.0. Download (143Kb)

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Abstract

Accurate measurements of bulk minority carrier lifetime are essential in order to determine the true limit of silicon's performance and to improve solar cell production processes. The thin film which forms when silicon wafers are dipped in solutions containing superacids such as bis(trifluoromethane)sulfonimide (TFSI) has recently been found to be effective at electronically passivating the silicon surface. In this paper we first study the role of the solvent in which TFSI is dissolved for the passivation process. We study ten solvents with a wide range of relative polarities, finding TFSI dissolved in hexane provides improved temporal stability, marginally better passivation and improved solution longevity compared to dichloroethane which has been used previously. Sample storage conditions, particularly humidity, can strongly influence the passivation stability. The optimised TFSI-hexane passivation scheme is then applied to a set of 3 Ω cm n-type wafers cut from the same float-zone ingot to have different thicknesses. This enables the reproducibility of the scheme to be systematically evaluated. At 1015 cm−3 injection the best case effective surface recombination velocity is 0.69 ± 0.04 cm/s, with bulk lifetimes measured up to the intrinsic lifetime limit at high injection and > 43 ms at lower injection. Immersion of silicon in superacid-based ionic solutions therefore provides excellent surface passivation, and, as it is applied at room temperature, the effects on true bulk lifetime are minimal.

Item Type:	Dataset
Subjects:	Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Engineering
Type of Data:	Experimental data
Library of Congress Subject Headings (LCSH):	Passivity (Chemistry), Interfaces (Physical sciences), Solar cells -- Materials, Silicon solar cells, Superacids
Publisher:	School of Engineering, University of Warwick
Official Date:	2018
Dates:	Date Event 14 March 2018 Accepted 2018 Published
Status:	Not Peer Reviewed
Publication Status:	Published
Media of Output:	.xlsx; .txt
Access rights to Published version:	Open Access
Description:	The dataset (a single file in XLSX format) contains the data behind all the graphs presented in the paper. Each worksheet within the file relates to a single figure in the paper. Captions to the figures are given in the paper. Abbreviations, variables and methods used are defined in the paper.
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/M024911/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/N509796/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/L015307/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 RG100076 [RS] Royal Society http://dx.doi.org/10.13039/501100000288
Related URLs:	Related item in WRAP Publisher
Contributors:	Contribution Name Contributor ID Depositor Murphy, John D. 55925

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