Abstracts Book - IMRC 2018

• SC3-P006
TERNARY N-TYPE CuIn3Se5 PHOTOANODE ELETRODES FOR
PHOTOINDUCED HYGROGEN GENERATION
Joo Sung Kim 1 , Young Been Kim 1 , Hyungkoun Cho 1
1 Sungkyunkwan University, School of Advanced Materials Science & Engineering, Korea.
Conventional p-CuInSe2 absorbers for solar cells have been homogenously
synthesized using multi-step process despite a narrow crystal phase region in
the phase diagram and the existence of various secondary phases. In contrast,
here we propose artificially-designed heterophasic blended copper indium
selenide compounds for water splitting photoanodes using a simple one-step
annealing synthetic process where the electrodeposited metal precursors were
directly annealed with Se vapor injection and without additional intermediate
steps. The resultant product is revealed to possess a novel “phase-blended
structure” comprising two phases of p-type CuInSe2 and n-type CuIn3Se5
crystals. The CuInSe2 nanoparticles with a higher Cu fraction are threedimensionally
(3D) embedded in the n-type CuIn3Se5 matrix, which has been
verified by various analysis methods such as X-ray diffraction, transmission
electron microscopy, and capacitance-voltage curve. The average diameter of
the CuInSe2 nanoparticles is 66.8 nm and the interval between the
nanoparticles in the CuIn3Se5 matrix is 67.6 nm. Consequently, the phaseblended
structure photoabsorber exhibits a remarkably enhanced anodic
photocurrent of 12.7 mA/cm2 at 1.23 V versus the reversible hydrogen
electrode.
Keywords: photoelectrode, hydrogen, chalcogenide
Presenting authors email: hrtemchohk@gmail.com