Inks of Functionalized p-Type Lead Sulfide Quantum Dots for One-Step Fabrication of Heterojunction Photovoltaics
Publish place: The 6th International Conference on Exhibitiion on Metallurgy and Materials Engineering
Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
IMES11_478
تاریخ نمایه سازی: 7 اسفند 1396
Abstract:
Heterojunction quantum dot solar cells (QDSCs) are a new and interesting kind of the low-cost and solution processable solar energy harvesting assemblies. Fabrication of such devices is accompanied by some limitations regarding to the presence of long-chain ligands on the surface of synthesized nanoparticles as well as high oxidation rate of QDs in air. Changing the surface chemistry of particles through exchange of long-chain ligands is an idea for stabilization of the QDs surfaces. This study investigates functionalization of lead sulfide QDs by short-length organic ligands and subsequent fabrication of QDSCs. In this method, inks of pre-exchanged PbS QDs were prepared through the solution phase exchange of oleate ligands with butylamine (BA) and mercaptopropionic acid (MPA) ligands. Surface chemistry of the exchanged QDs were investigated by the means of TEM and FT-IR analyses. Heterojunction solar cells of different p-type QD layers were subsequently fabricated by single-step deposition of prepared inks on FTO+TiO2 substrates and subsequent Au deposition. The power conversion efficiency (PCE) of solar cells fabricated by the ink of OA, BA and MPA-capped QDs were 0.03, 1.15 and 2.99%, respectively.
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Authors
Hossein Beygi
PhD Student in materials science and metallurgical engineering
Seyyed Abdolkarim Sajjadi
Professor in materials science and metallurgical engineering
Abolfazl Babakhani
Associate professor in materials science and metallurgical engineering
Jeff F. Young
Professor in physics