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Photonic Enhancement of Colloidal Qu...

Labelle, Andre Jean-Romeo Richard.

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Photonic Enhancement of Colloidal Quantum Dot Photovoltaics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Photonic Enhancement of Colloidal Quantum Dot Photovoltaics./
作者:	Labelle, Andre Jean-Romeo Richard.
面頁冊數:	123 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.
Contained By:	Dissertation Abstracts International77-06B(E).
標題:	Nanotechnology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10001035
ISBN:	9781339412948

Photonic Enhancement of Colloidal Quantum Dot Photovoltaics.
Labelle, Andre Jean-Romeo Richard.

Photonic Enhancement of Colloidal Quantum Dot Photovoltaics. - 123 p.

Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2015.

Colloidal quantum dots, nanocrystal semiconductors that can be cross-linked and assembled into absorbing thin films, are an attractive material for third-generation photovoltaic applications due to low-cost fabrication and bandgap tunability.

ISBN: 9781339412948Subjects--Topical Terms:

526235
Nanotechnology.

Photonic Enhancement of Colloidal Quantum Dot Photovoltaics.
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245 1 0 $a Photonic Enhancement of Colloidal Quantum Dot Photovoltaics.
300 $a 123 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.
500 $a Adviser: Edward H. Sargent.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2015.
520 $a Colloidal quantum dots, nanocrystal semiconductors that can be cross-linked and assembled into absorbing thin films, are an attractive material for third-generation photovoltaic applications due to low-cost fabrication and bandgap tunability.
520 $a As a result of their limited charge transport, these solution-processed thin films suffer from a mismatch in absorption length and charge extraction length. Concepts based on the interdigitation of n- and p-doped layers, approaches that reduce the distance photogenerated carriers must travel before extraction, offer promise on overcoming this limitation. In this thesis, I explore and develop techniques to address the absorption-extraction compromise in CQD materials by implementing nano- and micro-structuring techniques to enhance light absorption in the active film.
520 $a First, I focus on the development of nanomaterials for light guiding/scattering enhancement in CQD films. For this, I develop a nanostructured gold reflector that, when suitably designed, guides light and traps it within the active film. I show that this yields enhanced broadband absorption with more than 4-fold improvement at the most improved wavelength, which translated into a 34% improvement in photocurrent in a working solar cell. I also show that periodic nanostructures employed for absorption enhancement can lead to improvements in solar cell performance. Limitations in device architecture and film formation, however, prevented significant performance advances for these nano-scale approaches. Regardless, these early results pointed me to a new and more impactful strategy.
520 $a I focus in on realizing micron-scale structured electrodes to enhance absorption, which I show to be considerably more useful in view of the need to extract charge carriers with high efficiency. I discover that conformal film formation atop these structured electrodes is an absolute prerequisite to enhancing performance. These devices, which I term micro-pyramid CQD cells, provide a 24% enhancement in current and a consequent 15% improvement in power conversion efficiency.
520 $a Ultimately, this work offers a prescription for photonic enhancements of solar cells within this emerging class of photovoltaic materials.
590 $a School code: 0779.
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710 2 $a University of Toronto (Canada). $b Electrical and Computer Engineering. $3 2096349
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792 $a 2015
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