Browsing by Author "Chang, Yung"

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Effects of nanomorphological changes on the performance of solar cells with blends of poly[9,9 '-dioctyl-fluorene-co-bithiophene] and a soluble fullerene
(2009-01-14)
Huang, Jen-Hsien
;
Ho, Zhong-Yo
;
Kekuda, Dhananjay
;
Chang, Yung
;
Chu, Chih-Wei
Controlled nanophase segregation within the blended films of a conjugated polymer and a soluble fullerene has enabled us to form a continuous transfer pathway for the carriers, thereby increasing the photocurrent generation for polymer photovoltaic devices. Here, we study the effects of nanomorphological changes on the performance of polymer solar cells using blended films of poly[9,9'-dioctyl-fluorene-co-bithiophene] (F8T2) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Different weight ratios of the F8T2 and PCBM blends in various solvents were studied at different annealing temperatures. The morphology of the films seems to be a strong function of the processing conditions. The power conversion efficiency (PCE) of the photovoltaic devices has improved significantly from 0.34% to 2.14% under air mass 1.5 simulated solar illumination (100 mW cm(-2)), which could be attributed to the nanomorphological changes in the films.
On-Demand Memory Sub-System for Multi-Core SaCs
(2011)
Huang, Po-Tsang
;
Chang, Yung
;
Hwang, Wei
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
For heterogeneous multi-core SoCs, the increasing demand of the memory capacity and bandwidth becomes a critical design challenge. In this paper, an on-demand memory sub-system is presented to efficiently control the memory access and memory resource allocation using adaptively allocated cache memory. The proposed adaptively allocated cache memory can dynamically assign a variable number of SRAM banks for process elements (PEs) to optimize the utilization of the centralized on-chip cache. In a wireless video entertainment system, a 7.13% execution time reduction and 10.53% energy reduction of memories can be achieved using the adaptively allocated cache memory.