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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Photovoltaic Effects of the CdS and PbS Quantum Dots Encapsulated in Zeolite Y

2012년 2월 16일 15시 21분 53초
INOR.P-229 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
김현성, 윤경병
서강대학교 화학과, Korea
Photovoltaic (PV) effects of the CdS and PbS quantum dots (QDs) encapsulated in zeolite-Y were studied. For this, zeolite-Y films with the thicknesses between 350 and 2,500 nm were grown on ITO glass and into which 3.2, 4.3, and 6.3 CdS and 3.4, 4.6, and 6.7 PbS per unit cell, respectively, were loaded. They are denoted as (CdS)nYf and (PbS)nYf, respectively, where n denotes the loaded amount. At higher loadings of CdS or PbS the films underwent crack formation. (CdS)nYf showed a novel PV effect with Pt-coated ITO glass as the counter electrode in the electrolyte solution consisting of Na2S (1 M) and NaOH (0.1 M). In contrast, (PbS)nYf showed a negligible PV effect. The PV effect increased with increasing the loaded amount (n) of CdS and increasing the film thickness. In the case of (CdS)6.3Yf/Pt, the short circuit current (Isc), open circuit voltage (Voc), fill factor (FF), and the efficiency (η) were 0.3 mA cm-2, 423 V, 28, and 0.1%, respectively, under the AM 1.5, 100 mW cm-2 condition. The efficiency decreased by only 10% after 18 days of continuous measurements. The PV efficiency of (CdS)6.3Yf increased by three times when it was coupled to (PbS)6.7Yf. Under this condition the IPCE value at 398 nm was 42% and the APCE value was 82% at 405 nm. In the case of (CdS)6.3Yf, the volume fraction of CdS in (CdS)6.3Yf is only 2.2% and the minimum edge-to-edge distance between the photoactive QDs was 5.6 nm. The negatively charged framework, the charge-balancing cations, and the strong electric fields produced by them are proposed to be responsible for the very long distance carrier mobility in (CdS)6.3Yf.