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TOPIC：High Efficiency Vacuum-Processed Organic Solar Cells
SPEAKER：Prof. Ken-Tsung Wong（汪根欉），臺灣大學(xué)
TIME： 2019年8月7日（星期三），上午10:00?
LOCATION：化學(xué)B樓410室
INVITER：鐘洪亮 特別研究員


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Abstract
Organic photovoltaics (OPVs) have attracted considerable research interests due to their low cost and low energy consumption in fabrication. While intensive interdisciplinary efforts have been dedicated to improving the power conversion efficiencies (PCEs) of organic solar cells employing small molecules as electron donors. To date, small molecule-based organic solar cells (SMOSCs) using p-type small molecules and n-type fullerenes have achieved remarkable PCEs by using either solution-processed or vacuum-deposited fabrication techniques. The search for new donor materials with promising physical properties such as low band gaps, suitable energy levels, high crystallinity, and decent solubility, etc., has taken the center stage. Along this line, a large number of donor molecules with interesting molecular architectures have been extensively investigated to perform varying degrees of success. We reported new organic molecules adopting a donor-acceptor-acceptor (D-A-A) configuration [1], in which an electron-donating moiety is connected to an electron withdrawing dicyanovinylene moiety through another electron-accepting arene, exhibited narrow optical band gaps and lower HOMO levels, showing potential to concurrently enhance the short circuit current density (Jsc) and open circuit voltage (Voc) as employed in organic photovoltaics. In this seminar, vacuum-processed heterojunction devices incorporating D-A-A type donors (Figure 1) and fullerene (C70) acceptor achieved power conversion efficiencies exceeding 9% [2][3] will be presented.

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