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Author Li, X.; Shen, K.; Li, Q.; Deng, Y.; Zhu, P.; Wang, D.
Title Roll-over behavior in current-voltage curve introduced by an energy barrier at the front contact in thin film CdTe solar cell Type Journal Article
Year 2018 Publication Solar Energy Abbreviated Journal
Volume 165 Issue Pages 27-34
Keywords AlO HRT layer, Band alignment, CdTe solar cell, Roll-over behavior
Abstract Roll-over phenomenon in the current–voltage (J–V) curve is often observed in a CdTe thin film solar cell. The roll-over phenomenon, which is occurred near the open-circuit voltage in a light J–V curve, is due to Schottky energy barrier formed at the CdTe/metal interface in a CdTe solar cell back contact. In this study we report a J–V roll-over phenomenon which is induced by an energy barrier at the front contact of a CdTe solar cell. Two kinds of oxides, namely, Al2O3 and SnO2, were deposited as high-resistance transparent (HRT) layer between the window layer CdS and the fluorine doped tin oxide (FTO) front electrode in CdTe solar cells. These two oxides present much different electronic band alignment with FTO and CdS. SnO2 formed almost no energy barrier with CdS, this allowed smooth transport for photo-generated electrons from CdTe to CdS and FTO. However, Al2O3 formed a high energy barrier with CdS. The rather high energy barrier with a value of 3.43 eV at the CdS/Al2O3 interface induced a J–V roll-over phenomenon in a CdTe thin film solar cell, which dramatically led to a quick decrease for the cell device efficiency. The electron transport at the FTO/Al2O3/CdS interface is governed by tunneling effect. The results presented in this study demonstrate that the band structure at the front electrode plays an important role for the performance of a CdTe thin film solar cell.
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ISSN (down) 0038-092x ISBN Medium
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Call Number THL @ christoph.kuells @ li_roll-over_2018 Serial 187
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Author Androvitsanea, A.; Fawzy, M.; Fuchs, J.; Külls, C.; Fahlbusch, H.; Heiden, J.
Title Hydrologische Bedingungen im Heraion von Samos vom 12. bis 8. Jh. v. Chr. und ihre Bedeutung für die wasserbauliche Infrastruktur Type Journal Article
Year 2018 Publication Environmental Water Engineering Abbreviated Journal
Volume 1 Issue 1 Pages 1-21
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Call Number THL @ christoph.kuells @ Androvitsanea2018hydrologische Serial 17
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Author Ardelt, G.; Külls, C.; Hellbrück, H.
Title Towards intrinsic molecular communication using isotopic isomerism Type Journal Article
Year 2018 Publication Open Journal of Internet Of Things (OJIOT) Abbreviated Journal
Volume 4 Issue 1 Pages 135-143
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Call Number THL @ christoph.kuells @ Ardelt2018towards Serial 18
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Author Röttcher, K.
Title Type Book Chapter
Year 2018 Publication Risikomanagement und Nachhaltigkeit in der Wasserwirtschaft: Erfolgreiche Navigation durch die Komplexität und Dynamik des Risikos Abbreviated Journal
Volume Issue Pages 165-174
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Abstract Im vorliegenden Beitrag werden beispielhaft unterschiedliche Ansätze des Risikomanagements und das Verständnis von Nachhaltigkeit in der Wasserwirtschaft dargelegt. Die Darstellung richtet sich insbesondere an Leser aus anderen Fachdisziplinen, wie das Rechts- und Finanzwesen, den Fahrzeug- und Maschinenbau oder auch die sozialen Berufe. Die Zusammenhänge werden überblicksartig mit einzelnen konkreten Beispielen dargestellt mit dem Fokus auf die grundsätzlichen Denk- und Vorgehensweisen.
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Publisher Springer Fachmedien Wiesbaden Place of Publication Wiesbaden Editor Michalke, A.; Rambke, M.; Zeranski, S.
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ISSN (down) ISBN 978-3-658-19684-4 Medium
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Notes Approved no
Call Number THL @ christoph.kuells @ Röttcher2018 Serial 90
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