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Large area survey grain size and texture optimization for thin film CdTe solar sells using xenon-plasma focused ion beam (PFIB)
conference contribution
posted on 2023-01-04, 10:07 authored by Vlad KornienkoVlad Kornienko, Ochai Oklobia, Stuart Irvine, Steve Jones, Giray Kartopu, Ali AbbasAli Abbas, Yau TseYau Tse, Jake BowersJake Bowers, Kurt BarthKurt Barth, Michael WallsMichael WallsMicrostructural analysis of high efficiency thin film CdTe solar cells has been obtained over large areas. Analysis regions are device cross-sections approximately 0.325 mm in length. The samples have been prepared using a xenon-plasma focused ion beam (Xe-PFIB). The detailed images of the microstructure were obtained using backscattered electron imaging and electron backscatter diffraction (EBSD). As deposited devices and those with a low level of cadmium chloride treatment both show strong (111) growth texture. A high density of twins is seen in the columnar grains. Three As doped FTO/CdZnS/CdTe with varying process conditions we devices with 13.1 %, 16.3% and 17% conversion efficiency were investigated. Lowest efficiency device was CdCl2 treated at 420°C for 10 minutes while the 16.3 and 17% devices were both treated at 440°C for 10 minutes. The large area analysis revealed a partial recrystallisation state in the 16.3% efficient device which was induced by an incomplete chloride activation process. The analysis confirms that the efficiency of the devices tends to correlate with grain size. It also showed that a strong correlation exists between device efficiency and the randomization of the texture away from the (111) grain orientation. EBSD can be used to survey large areas and to mark out features for more detailed analysis using transmission electron microscopy (TEM). As an example, we show how using an EBSD scanned cross-sectional area can identify a partially recrystallized region which is then extracted and analyzed in detail using TEM.
Funding
Doped emitters to unlock lowest cost solar electricity
Engineering and Physical Sciences Research Council
Find out more...EPSRC EP/W000555/1
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
- Mechanical, Electrical and Manufacturing Engineering
Department
- Materials
Research Unit
- Centre for Renewable Energy Systems Technology (CREST)
Published in
2022 IEEE 49th Photovoltaics Specialists Conference (PVSC)Pages
63 - 68Publisher
IEEEVersion
- VoR (Version of Record)
Rights holder
© IEEEPublisher statement
Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Publication date
2022-11-14Copyright date
2022ISBN
9781728161174; 9781728161181Publisher version
Language
- en
Location
Philadelphia, PA, USAEvent dates
05th June 2022 -10th June 2022Depositor
Vlad Kornienko. Deposit date: 20 December 2022Usage metrics
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