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Broadband absorbing bulk heterojunction photovoltaics using low-bandgap solution-processed quantum dots
Kevin M Noone1, Elisabeth Strein, Nicholas C Anderson
1Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
Nano Letters
|July 1, 2010
Summary
New bulk heterojunction solar cells using lead sulfide (PbS) quantum dots blended with a specific polymer, poly(2,3-didecyl-quinoxaline-5,8-diyl-alt-N-octyldithieno[3,2-b:2
Area of Science:
- Materials Science
- Nanotechnology
- Photovoltaics
Background:
- Bulk heterojunction (BHJ) solar cells are a key area of renewable energy research.
- Lead sulfide (PbS) quantum dots offer tunable optical properties for infrared light absorption.
- Developing efficient donor-acceptor conjugated polymers is crucial for improving BHJ solar cell performance.
Purpose of the Study:
- To investigate the performance of BHJ solar cells incorporating PbS quantum dots with novel donor-acceptor conjugated polymers.
- To identify polymer-PbS quantum dot blends that enhance photoinduced charge generation.
- To evaluate the power conversion efficiencies of these novel BHJ solar cell configurations.
Main Methods:
- Synthesis and characterization of new donor-acceptor conjugated polymers.
- Fabrication of BHJ solar cells using blends of PbS quantum dots and various conjugated polymers.
- Photoinduced absorption spectroscopy to analyze charge generation dynamics.
- Photovoltaic device testing to determine power conversion efficiencies.
Main Results:
- Blends of PbS quantum dots with poly(2,3-didecyl-quinoxaline-5,8-diyl-alt-N-octyldithieno[3,2-b:2',3'-d]pyrrole) (PDTPQx) demonstrated significantly higher photoinduced charge generation compared to other blends.
- PDTPQx/PbS blends outperformed blends with traditional polymers like MDMO-PPV and P3HT.
- Photovoltaic devices utilizing PDTPQx/PbS blends achieved power conversion efficiencies 10-100 times greater than previously reported for IR-absorbing quantum dot BHJ solar cells.
Conclusions:
- The novel polymer PDTPQx is highly effective in combination with PbS quantum dots for BHJ solar cells.
- These findings represent a significant advancement in the development of efficient quantum dot-based photovoltaic devices.
- The enhanced charge generation and power conversion efficiencies highlight the potential of these materials for future solar energy applications.
