Betavoltaic Anode Structure With Quantum Dots for Lower Recombination Loss
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Solution Overview
Problem
Betavoltaic batteries face issues with high energy loss and low current density due to inefficient beta particle conversion and recombination in traditional P-N junction semiconductor structures, and dye-sensitized batteries suffer from energy loss due to long radiation absorber to beta source distances.
Innovation Solution
An anode structure for betavoltaic batteries is developed, comprising a conductive substrate with a radiation absorption layer of inorganic particles treated with titanium tetrachloride and adsorbed dyes, and a beta emission layer of quantum dots including a radioactive isotope, optimized for improved energy absorption and conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of material including beta source is increased, then the amount of beta source is increased, but the number of electrons and holes which recombine is increased
Solution Approach 1:
The patent divides the battery structure into distinct functional layers: a beta source layer containing quantum dots with radioactive isotopes, a radiation absorber layer with dye-sensitized TiO2 nanoparticles, and charge transport layers. This segmentation allows the beta source amount to be increased in the dedicated source layer without increasing recombination loss, as the absorbed radiation is efficiently transferred to the radiation absorber layer where electron-hole pairs are generated and separated.
2Device complexity
If a beta source is located on the P-N junction semiconductors, then the structure is simplified, but beta particles emitted upwards and laterally are not converted into electric power
Solution Approach 1:
The patent introduces a radiation absorber layer containing dye-sensitized TiO2 nanoparticles as an intermediary between the beta source layer and the charge transport layers. This intermediary efficiently absorbs beta particles and converts their kinetic energy into electron-hole pairs, which are then separated and transported to generate electricity. This mediator approach enables complete conversion of beta particles regardless of emission direction, eliminating the loss of upward and lateral emissions.
3Stability of the object's composition
If the distance between radiation absorber and beta source is increased, then the structure is more stable, but energy loss is great
Solution Approach 1:
The patent employs thin-film structures for both the beta source layer and radiation absorber layer, with each layer optimized to be sufficiently thin to maintain strong interaction between beta particles and the radiation absorber. The TiO2 nanoparticle layer acts as a flexible intermediate medium that can be deposited as a thin film, ensuring minimal distance for efficient energy transfer while maintaining structural stability through the robust nanoparticle network and adhesive interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The anode structure enhances energy absorption and electrochemical properties, reducing energy loss and increasing the efficiency of beta particle conversion, resulting in higher power output and improved performance compared to traditional designs.
Implementation Method 1
quantum dots including a radioactive isotope configured to emit beta ray(s)
Implementation Method 2
a betavoltaic battery which absorbs beta rays emitted from a radioactive isotope through the surface of P-N junction semiconductors, and converts the beta rays into electric energy
Implementation Method 3
Electron-hole pairs may be produced in a space charge region in the P-N junction semiconductors by the beta rays
Implementation Method 4
a radiation absorption layer including inorganic particle(s) and dye(s) adsorbed onto the inorganic particle(s)
Data Source
AI summary
An anode for betavoltaic batteries and a method for manufacturing the anode are described. In the anode, quantum dots including a radioactive isotope are provided to a radiation absorber so as to be introduced as a beta source.