Achieving Efficient Organic Optoelectronics via Stamping Technique
Date Issued
2011
Date
2011
Author(s)
Kuo, Tsung-Hsien
Abstract
Solid type polymer solar cells (PSCs) have been extensively studied in this decade, although the efficiency is still lower than 5~6%. Its low fabrication cost, easy processing, and flexible property make it attractive to researchers. The PSCs and polymer light emitting diodes (PLEDs) were demonstrated by incorporating multilayer structure through solution process. In order to prevent the dissolution of the bottom layer by the subsequent process, we use a poly(di-methyl-silane) stamp to transfer the active layer onto the target surface. We introduced the strategical multilayer structure by using our previous developed stamping technique. In order to minimize the unfavorable contact between organics and electrodes for bulk heterojunction (BHJ) solar cells while not losing much the donor and acceptor junctions, we studied the bilayer structure which consists of different fraction of poly(3-hexylthiophene) (P3HT)/ [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blend layers. Furthermore, in order to balance carrier transport for PLEDs, we also studied the bilayer structure which consists of a bule-polyfluorene as light emitting layer (LEL) and poly(9,9-di-n-octylfluorene-alt-(1,4-phenylene-((4-sec-butylphenyl) imino-1,4 -phenylene)) (TFB) as a electron-blocking layer (EBL).
We found that the efficiency of devices was readily manipulated by changing the constitution of each stacking layer. After optimizing the fabrication conditions for each functional layer, we obtained PSCs reaching a power conversion efficiency of 3.52%. The efficiency of PLEDs incorporating an EBL was 27% greater (reaching 4.7 cd A–1) than that prepared without an EBL layer.
Subjects
fullerene
heterojunction
light emitting diode
polymer
stamping process.
Type
thesis
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