Browsing by Author "CHU, ML"

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EFFECT OF SIDE-CHAIN LENGTH ON RECTIFICATION AND PHOTOVOLTAIC CHARACTERISTICS OF POLY(3-ALKYLTHIOPHENE) SCHOTTKY BARRIERS
(1992-10-15)
FANG, Y
;
CHEN, SA
;
CHU, ML
;
光電工程學系
;
Department of Photonics
Schottky diodes of aluminium/poly(3-alkylthiophene) (P3AT)/indium-tin oxide (ITO) with large area (0.15-0.5 cm2) are prepared using the proposed new casting technique. The P3ATs investigated involve poly(3-butylthiophene) (P3BT), poly(3-octylthiophene) (P3OT) and poly(3-dodecylthiophene) (P3DDT), which are prepared using the chemical method. The diodes, in which P3AT behaves as a p-type semiconductor, exhibit a moderate rectifying behaviour and low leakage current. Photovoltaic measurements show a power conversion efficiency of about 10(-2)-10(-3)% at a light intensity of 0.5-5 mW/cm2, which decreases with increasing light intensity. The longer alkyl side-chain length of P3ATs can cause a lower rectifying effect, barrier height, depletion region width and photovoltaic conversion efficiency.
EFFECT OF SN ON THE SUPERCONDUCTIVITY OF THE DYBA2CU3O7-DELTA SYSTEM
(1989-12-01)
WANG, C
;
CHEN, LT
;
CHANG, HL
;
CHU, ML
;
HSU, FW
EFFECTS OF ZRO2 ON THE TEXTURING AND PROPERTIES OF MELT-PROCESSED Y1BA2CU3O7-DELTA
(1994-04-25)
JUANG, JY
;
WU, CL
;
WANG, SJ
;
CHU, ML
;
WU, KH
The addition of ZrO2 is found to be very effective as the nucleation sites to promote the oriented growth of Y1Ba2Cu3O7-delta (YBCO) during peritectic solidification. Extended regions of well-textured YBCO grains with superior superconducting properties of the YBCO bulk are readily obtained by a single-step melt process at much lower process temperatures. At 77 K, the platelike Josephson weak-link behaviors observed in pure melt-processed YBCO have been effectively eliminated, indicating that the coherency between the spherulitic superconducting YBCO grains may have been greatly improved by ZrO2 additions.
FLUX LINE DYNAMICS CROSSOVER IN THE TL-BA-CA-CU-O THIN-FILM
(1990-11-01)
WANG, CY
;
CHANG, HL
;
CHU, ML
;
JUANG, JY
;
GOU, YS
By extending the observation of the current-voltage characteristics to a much higher dissipative state, the flux-line motion experiences at least two stages of crossover, namely, from glassy hopping to creep-dominating, and finally an abrupt transition into the flow regime.
GROWTH OF PULSED-LASER DEPOSITED YBCO THIN-FILMS ON YSZ AND YSZ/SI SUBSTRATES
(1994-02-01)
JUANG, JY
;
KAO, RT
;
HSIEH, MC
;
LI, MH
;
CHU, ML
The growth mechanism of superconducting YBCO thin films deposited in - situ on both single crystalline YSZ and YSZ-buffered Si substrates as revealed by scanning tunneling microscopy (STM) are found to be very different. The results are attributed to the initial surface condition of the substrates.
PREPARATION OF TL2CA2BA2CU3OX SUPERCONDUCTING THIN-FILMS BY DC SPUTTERING
(1989-04-01)
CHANG, HL
;
WANG, C
;
CHU, ML
;
UEN, TM
;
GOU, YS
SYNTHESIS PROCESS OF THE HIGH-TC SUPERCONDUCTOR IN THE TL2CA2BA2CU3OX PHASE
(1989-04-01)
WANG, C
;
CHANG, HL
;
CHU, ML
;
GOU, YS
;
UEN, TM
THE MAGNETIC AND TRANSPORT-PROPERTIES OF HIGH-CRITICAL-CURRENT TL2BA2CA2CU3OX SUPERCONDUCTING THIN-FILMS
(1991-08-26)
CHU, ML
;
CHANG, HL
;
WANG, C
;
JUANG, JY
;
UEN, TM
Highly c-axis-oriented Tl2Ba2Ca2Cu3O(x) superconducting thin films with the critical current density as high as 1 X 10(7) A/cm2 at 87 K were obtained by single-target dc sputtering on LaAlO3 (100) substrates followed by encapsulated compensate annealing. The strong linear temperature dependence of zero-field critical current at low temperatures suggests a creep-dominated behavior. Preliminary field dependence studies on the critical current density in low-field regime (< 2 kOe) shows no evidence of hysteresis commonly encountered in films with higher granularity. The scaling behavior of the global pinning force density exhibits strong resemblance to conventional type-II superconductors with the pinning force density of the same order of magnitude as that in strong pinned NbN thin films.