Method To Synthesize Colloidal Iron Pyrite Nanocrystals And Fabricate Thin Film Solar Cells Of Same
The great potential of pyrite lies in its superior scalability to terawatt (TW) levels of solar energy conversion than existing thin film technologies and its much lower cost than silicon.
Terawatt level energy generation.
Pyrite iron persulfide is an under-researched, extremely promising semiconductor for use as the light-absorbing layer in thin-film photovoltaics (PV). University researchers have invented the first method to produce phase pure, colloidal pyrite nanocrystals on a large scale for use in thin film solar cells. Pyrite nanocrystals (NCs) are of particular interest for low-cost solar energy conversion because of the prospect of fabricating inexpensive, large-area modules by the roll-to-roll printing or spraying of NC “solar paint” onto flexible metal foils. Nanocrystal-based devices can achieve excellent manufacturing scalability at lower cost ($/Wp) than conventional single-crystal Si and existing thin film technologies. Furthermore, university researchers have conceived of all the steps needed to manufacture an efficient, low-cost p-n heterojunction solar cell from this pyrite paint. Nanocrystalline pyrite films are made by dip coating, inkjet printing, or doctor blading the paint/paste onto stainless foil. These films are sintered in special gas mixtures to yield stoichiometric polycrystalline pyrite films with carrier diffusion lengths that are significantly longer than the average optical absorption length. The surfaces of the films are then passivated chemically to increase the surface band gap and reduce the surface recombination velocity. The heterojunction partner is a window layer deposited by chemical bath deposition (CVD) or another method. The transparent top contact is made by sputtering, CBD, ALD, or another method. Since this pyrite cell design mimics commercialized CdTe and CIGS technology, this technology can be quickly incorporated into existing production lines.
Patent Number: US20110240108A1
Application Number: US13079697A
Inventor: Law, Matt | Seefeld, Sean | Puthussery, James
Priority Date: 2 Apr 2010
Priority Number: US20110240108A1
Application Date: 4 Apr 2011
Publication Date: 6 Oct 2011
IPC Current: H01L003106 | B05D000302 | B05D000304 | B05D000312 | B05D000512 | C01G004912 | C23C001630 | H01L00310392 | B82Y004000
US Class: 136255 | 423565 | 427074 | 4271261 | 427240 | 4272481 | 427377 | 977896
Title: Method To Synthesize Colloidal Iron Pyrite (FeS2) Nanocrystals And Fabricate Iron Pyrite Thin Film Solar Cells
Usefulness: Method To Synthesize Colloidal Iron Pyrite (FeS2) Nanocrystals And Fabricate Iron Pyrite Thin Film Solar Cells
Summary: Used as a pyrite heterojunction thin film photovoltaic device such as solar cell.
Novelty: Pyrite heterojunction thin film photovoltaic device such as solar cell comprises conductive bottom substrate acting as electrical contact, pyrite thin film, semiconductor window layer, transparent top contact, and encapsulation layer
Environmental/Green Technology
Solar Cell
9862617
Additional Technologies by these Inventors Tech ID/UC Case 22007/2010-158-0 Related Cases 2010-158-0
USA
