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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Published on: August 23, 2012

A micro-sized bio-solar cell for self-sustaining power generation.

Hankeun Lee¹, Seokheun Choi

¹Bioelectronics & Microsystems Laboratory, Department of Electrical & Computer Engineering, State University of New York-Binghamton, Binghamton, NY 13902, USA. sechoi@binghamton.edu.

|November 5, 2014

Summary

This study introduces a novel, scalable microliter bio-solar cell that generates electricity using microbial photosynthesis. It achieves enhanced power output, overcoming limitations of previous designs for self-sustainable energy applications.

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Area of Science:

Renewable Energy Technologies
Microbial Electrochemistry
Bio-photovoltaics

Background:

Self-sustainable energy sources are crucial for remote wireless applications.
Biological solar (bio-solar) cells offer self-assembling and self-repairing advantages.
Existing bio-solar cells face performance limitations and scale-up challenges.

Purpose of the Study:

To develop a self-sustainable and scalable microliter bio-solar cell.
To significantly enhance power output by optimizing energy capture and bacterial activity.
To address commercialization barriers of bio-solar cell technology.

Main Methods:

Designed a microliter-sized bio-solar cell within a ~300 μL single chamber.
Utilized laser-machined poly(methyl methacrylate) (PMMA) substrates.
Incorporated an air cathode for oxygen as an electron acceptor and controlled microchambers to maximize solar capture, bacterial attachment, and air bubble volume.

Main Results:

Achieved a maximum power density of 0.9 mW m(-2) using cyanobacteria (Synechocystis sp. PCC 6803).
Demonstrated the highest power density reported for micro-sized bio-solar cells.
The developed bio-solar cell is entirely self-sustainable and scalable.

Conclusions:

The novel microliter bio-solar cell design overcomes previous performance and scalability limitations.
This advancement represents a significant step towards practical applications of bio-solar energy.
The enhanced power density and scalability pave the way for commercial viability.