Rear interface engineering of hybrid organicsilicon nanowire solar cells via blade coating

Yi Chun Lai, Yu Fan Chang, Pei Ting Tsai, Jan Kai Chang, Wei Hsuan Tseng, Yi Cheng Lin, Chu Yen Hsiao, Hsiao-Wen Zan, Chih I. Wu, Gou Chung Chi, Hsin-Fei Meng, Pei-Chen Yu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

In this work, we investigate blade-coated organic interlayers at the rear surface of hybrid organic-silicon photovoltaics based on two small molecules: Tris(8-hydroxyquinolinato) aluminium (Alq3) and 1,3-bis(2-(4- Tert-butylphenyl)-1,3,4-oxadiazol-5-yl) benzene (OXD-7). In particular, soluble Alq3 resulting in a uniform thin film with a root-mean-square roughness < 0.2nm is demonstrated for the first time. Both devices with the Alq3 and OXD-7 interlayers show notable enhancement in the open-circuit voltage and fill-factor, leading to a net efficiency increase by over 2% from the reference, up to 11.8% and 12.5% respectively. The capacitance-voltage characteristics confirm the role of the small-molecule interlayers resembling a thin interfacial oxide layer for the Al-Si Schottky barrier to enhance the built-in potential and facilitate charge transport. Moreover, the Alq3 interlayer in optimized devices exhibits isolated phases with a large surface roughness, in contrast to the OXD-7 which forms a continuous uniform thin film. The distinct morphological differences between the two interlayers further suggest different enhancement mechanisms and hence offer versatile functionalities to the advent of hybrid organic-silicon photovoltaics.

Original languageEnglish
Pages (from-to)A414-A423
JournalOptics Express
Volume24
Issue number2
DOIs
StatePublished - 25 Jan 2016

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