Publication date: 1st April 2013
Lead sulfide (PbS) nanocrystal quantum dots (NQDs) have been extensively investigated lately with a hope for realizing next-generation (low-cost, high-efficiency) solar cells. A noticeable photoconversion efficiency of PbS QD solar cells has been achieved very recently, more than 7% (Ip et al., Nature Nanotechnology 2012). Multi-junction solar cell using different sized PbS quantum dots expect to provide higher efficiencies even further. Yet, small size PbS quantum dots with band gaps has not been investigated which is essential for efficient multi-layered PbS quantum dot solar cell.
We have firstly investigated the solar cell parameters of extremely confined ultra-small PbS NQDs. Specifically, we fabricated the Schottky structured device using synthesized PbS NQDs with their band gaps are upto 2.2 eV. Highest reported open circuit voltage of 0.67 V and quantum dot solar cell was achieved and power conversion efficiencies over 3 % under AM 1.5 was obtained via thickness and band gap control.
Choi, H.; Ko, J.; Kim, Y.; Jeong, S. Steric Hindrance Driven Shape Transition in PbS Quantum Dots: Understanding size dependent stability, J. Am. Chem. Soc 2013, 135(14), 5278-5281. Choi, H.; Kim, J.; Song, J.; Jeong, S.Increased open-circuit voltage in a Schottky device using PbS quantum dots with extreme confinement, Appl. Phys. Lett.,2013 Accepted
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