Mid-term Exam 10/23 (Thurs)

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Mid-term Exam 10/23 (Thurs) Closed book but bring a cheat sheet and a calculator No class this Thurs.

Lecture 10 Solid-Liquid Interface -Part II- Reference. R. Memming, Semiconductor Electrochemistry, Wiley-VCH, 2000 (e-book) A.J. Bard and L.R. Faulkner, Electrochemical Methods: Fundamentals and Applications, Wiley, 2001 J. O’M. Bockris, A.K.N. Reddy, and M. Gamboa-Aldeco, Modern Electrochemistry, Kluwer Academic/Plenum Publishers, 2000 Lecture note http://les.kaist.ac.kr/B_Lecture

Charge and Potential Distribution at the Interface Now you have a charge distribution at the interface. Then what happens at the interface? OK. Now you replace a metal electrode with a semiconductor. Then, how would the charge distribution change? Now the charges will be distributed in 1) 2) 3)

Semiconductor-Electrolyte Interface

The Mott-Schottky Plot

Electrode Potential vs. pH

Flatband Potential of n- vs. p-type SC

Flatband Potential of n-SC

Flatband Potential of p-SC

The electrode potential UE measured vs. a ref. electrode is UE = Dfsc + DfH + const Now, you apply a bias to the SC electrode. Then, how does this applied bias would change the potential distribution at the semiconductor/electrolyte interface?

Band Diagram of SC-Electrolyte Interface - Band Edge Pinning -

Band Edge Positions of Semiconductors

Unpinning of Energy Bands during Illumination

Semiconductor-Electrolyte Interface Charge distribution in a semiconductor and electrolyte Potential drop in a semiconductor Flatband potential (vs. pH) Band edge pinning

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