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임훈희(Hunhee Lim),최민재(Min-Jae Choi),정연식(Yeon Sik Jung) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.3
Third-generation photovoltaics are of low cost based on solution processes and are targeting a high efficiency. To meet the commercial demand, however, significant improvements of both efficiency and stability are required. In this sense, interfacial engineering can be useful key to solve these issues because trap sites and interfacial energy barrier and/or chemical instability at organic/organic and organic/inorganic interfaces are critical factors of efficiency and stability degradation. Here, we thoroughly review the interfacial engineering strategies applicable to three representative third-generation photovoltaics - organic, perovskite, colloidal quantum dot solar cell devices.
최재석,송준태,장호성,최민재,심동민,임순민,임훈희,정연식,오지훈 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.1
Photoelectrochemical (PEC) water splitting has emerged as a potential pathwayto produce sustainable and renewable chemical fuels. Here, we present a highlyactive Cu2O/TiO2 photocathode for H2 production by enhancing the interfacialband-edge energetics of the TiO2 layer, which is realized by controlling thefixed charge density of the TiO2 protection layer. The band-edge engineeredCu2O/TiO2 (where TiO2 was grown at 80 °C via atomic layer deposition)enhances the photocurrent density up to −2.04 mA/cm2 at 0 V vs. RHE under 1sun illumination, corresponding to about a 1,200% enhancement compared tothe photocurrent density of the photocathode protected with TiO2 grown at150 °C. Moreover, band-edge engineering of the TiO2 protection layer preventselectron accumulation at the TiO2 layer and enhances both the Faradayefficiency and the stability for hydrogen production during the PEC waterreduction reaction. This facile control over the TiO2/electrolyte interface willalso provide new insight for designing highly efficient and stable protectionlayers for various other photoelectrodes such as Si, InP, and GaAs.