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Large metastability in Cu (In,Ga)Se 2 devices: The importance of buffer properties
Author(s) -
Repins Ingrid,
Glynn Stephen,
Silverman Timothy J.,
Garris Rebekah,
Bowers Karen,
Stevens Bart,
Mansfield Lorelle
Publication year - 2019
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.3145
Subject(s) - metastability , buffer (optical fiber) , copper indium gallium selenide solar cells , materials science , optoelectronics , computer science , physics , telecommunications , solar cell , quantum mechanics
Some commercial Cu (In,Ga)Se 2 (CIGS) modules show large changes in current‐voltage parameters with light soaking. While such changes are not necessarily indicative of a performance problem, the associated uncertainty may be disadvantageous in a highly competitive market. Thus, it is beneficial to understand the origin of large metastabilities in order to define what processing changes might diminish metastability without impacting other desirable aspects of high‐performance devices. This study attempts to reproduce large metastabilities like those in some commercial products both through absorber and buffer processing variations in small devices. While variations of both types were found to affect metastability, only buffer variations could reproduce large metastability in high‐efficiency devices. Device modeling confirms that buffer effects alone are sufficient to explain the large metastability seen in these devices.