Instrumental Analysis of Silicon Heterojunctions

[wisegeek]

Homework Statement

Describe the process of creating a bulk heterojunction and an ordered heterojunction

Homework Equations

n/a

The Attempt at a Solution

I understand that each heterojunction has a cathode, anode, acceptor, and donor along with a indium tin oxide coating but I am unsure how I would put any of this together. I know I would used aluminum as the cathode and PEDOT:PSS for the anode but I am unsure of what solution I would used for an acceptor and donor along with how to put the whole thing together

 

[Asim Riaz]

. A bulk heterojunction is a type of organic solar cell consisting of an active layer of donor and acceptor materials in bulk form. The donor material is usually a conjugated polymer, and the acceptor is typically a fullerene derivative. The active layer is typically prepared by blending the two materials together in a solvent. The solution is then spin-coated onto a substrate, such as glass or plastic, which is also coated with an indium tin oxide (ITO) layer to allow for the collection of photogenerated electrons. Once dry, the device is then electrically connected to external circuitry, typically by attaching aluminum electrodes to the ITO contacts.An ordered heterojunction, on the other hand, is prepared by depositing alternating layers of donor and acceptor materials on top of a substrate. This approach has the advantage of producing more uniform and reproducible devices compared to bulk heterojunctions. The layers are typically deposited using techniques such as spin coating, blade coating, or inkjet printing. As before, the device is then electrically connected to external circuitry by attaching aluminum electrodes to the ITO contacts.