초음파 SILAR법으로 합성한 CdS 양자점 특성 = Synthesis of CdS Quantum Dots Using a Sonochemical-SILAR Method

다국어 초록 (Multilingual Abstract)

The quantum dot solar cell (QDSC) is a photovoltaic device that uses quantum dots as the absorbing photovoltaic material. Compared to the dye sensitized solar cell (DCCS), QDSC has a similar operating mechanism but has a lot of advantages such as higher absorption coefficient and a easy size controling of quantum dots(QDs).
In this study, QDs were synthesized using a conventional SILAR method and a sonochemically enhanced SILAR method, and the comparison between two methods was made. In particular, effects of the ultrasonic power applied in sonochemical process on the growth of the QDs were studied to confirm the advantages of the sonochemical technique.
Experimental results based on the data of UV-Vis absorbance and X-ray diffraction spectra revealed that the growth speed and light absorption of QDs depends strongly on the applied the ultrasonic power and that it played a crucial role to enhance the formation and growth of the QDs. Thus, a sonochemically enhanced SILAR technique introduced in this study is a very simple and effective process, compared to other methods for QDs, implying that it is also a suitable synthesis method for other practical uses.

목차 (Table of Contents)

• 1. 서 론 1
• 2. 이 론 3
• 2.1 양자점 3
• 2.1.1 양자점의 정의 3
• 2.1.2 양자 구속 효과 5
• 2.2 양자점 감응형 태양전지 6
• 2.3 초음파 증착법 8
• 3. 실 험 10
• 3.1 TiO2 나노입자의 합성 10
• 3.2 SILAR 방법을 이용한 CdS 양자점 합성 11
• 3.3 초음파 SILAR 방법을 이용한 CdS 양자점 합성 12
• 3.4 초음파 SILAR 방법을 이용한 초음파 power에 따른 CdS 양자점 합성 12
• 3.5 합성된 CdS 양자점/TiO2 나노입자의 분석 13
• 3.5.1 UV-Visible 흡수 스펙트럼 13
• 3.5.2 XRD 13
• 3.5.3 EDS 13
• 3.5.4 TEM 13
• 4. 결과 및 고찰 14
• 4.1 SILAR 방법 및 SC-SILAR 방법으로 합성한 CdS 양자점 14
• 4.1.1 SILAR 방법으로 합성한 CdS 양자점 14
• 4.1.2 SC-SILAR 방법으로 합성한 CdS 양자점 20
• 4.2 SC-SILAR 방법을 이용한 세기 변호에 따른 CdS 양자점 합성에 대한 분석 24
• 5. 결 론 33
• 참고문헌 34
• 영문초록 36