Browsing by Author "Xu, Zheng"

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Demonstration and Electrical Performance Investigation of Wafer-Level Cu Oxide Hybrid Bonding Schemes
(2011-08-01)
Chen, Kuan-Neng
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Xu, Zheng
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Lu, Jian-Qiang
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
Wafer-level Cu oxide hybrid bonding owns a number of merits, including simultaneous formations of electrical and mechanical bonds, underfill free, high alignment accuracy, increasing bond strength, and excellent reliability performance in 3-D integration. This letter demonstrates the fabrication of wafer-level Cu oxide hybrid bonding. Investigations of experimental and electrical simulation data of Cu oxide hybrid bonding structures are reported. Their alignment accuracy, frequency responses, and passive elements are compared for 3-D integration applications.
Vertical Phase Separation in Poly(3-hexylthiophene): Fullerene Derivative Blends and its Advantage for Inverted Structure Solar Cells
(2009-04-23)
Xu, Zheng
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Chen, Li-Min
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Yang, Guanwen
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Huang, Chun-Hao
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Hou, Jianhui
A method which enables the investigation of the buried interfaces without altering the properties of the polymer films is used to study vertical phase separation of spin-coated poly(3-hexylthiophene) (P3HT):fullerene derivative blends. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) analysis reveals the P3HT enrichment at the free (air) surfaces and abundance of fullerene derivatives at the organic/substrate interfaces. The vertical phase separation is attributed to the surface energy difference of the components and their interactions with the substrates. This inhomogeneous distribution of the donor and acceptor components significantly affects photovoltaic device performance and makes the inverted device structure a promising choice.