Inverted Organic PV Device with Reflective Electrode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic photovoltaic (PV) devices face challenges in efficiency and cost due to the use of expensive transparent substrates and the difficulty in producing large-area devices with low defects, while traditional silicon-based PV cells have limitations in stability and efficiency.
Innovation Solution
A method for preparing a metal substrate by attaching it to a rigid support, mechanically polishing, and applying an organic smoothing layer to create a planarized surface, which is then used in an inverted organic PV device with a reflective electrode and a transparent electrode, reducing surface roughness and enabling efficient power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional transparent substrates are used in organic PV devices, then device transparency and light transmission are improved, but production cost increases significantly
Solution Approach 1:
The patent inverts the conventional PV device structure by placing the transparent electrode on the bottom and the reflective metal substrate on top. This allows the use of inexpensive opaque substrates like stainless steel foil instead of expensive transparent substrates, while maintaining effective light absorption through the reflective backing that redirects unabsorbed photons back into the active layer.
2Manufacturing precision
If mechanical polishing is applied to metal substrate, then surface roughness is reduced, but production time and process complexity increase
Solution Approach 1:
The patent performs mechanical polishing and surface preparation as preliminary steps before device assembly. By pre-treating the metal substrate to achieve the desired surface roughness (Ra < 10 nm) before applying the organic active layers, the process ensures optimal surface quality for subsequent deposition steps without requiring additional time-consuming adjustments during device fabrication.
3Area of stationary object
If large-area organic PV devices are produced, then power generation capacity increases, but defect density and manufacturing difficulty increase
Solution Approach 1:
The patent changes the substrate parameters by using rigid, flat metal substrates with controlled surface roughness (Ra < 10 nm) instead of flexible or rough surfaces. This parameter control enables large-area deposition with uniform film quality, reducing defects and improving manufacturing consistency across large device areas while maintaining high power generation capacity.
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 method allows for the production of efficient and cost-effective organic PV devices with improved surface roughness, comparable to traditional devices, and extends the application of PV cells to flexible and inexpensive opaque substrates, enhancing power conversion efficiency and reducing production costs.
Implementation Method 1
Photosensitive optoelectronic devices convert electromagnetic radiation into electricity. Solar cells, also called photovoltaic (PV) devices, are a type of photosensitive optoelectronic device that is specifically used to generate electrical power.
Implementation Method 2
at least one transparent electrode to allow incident radiation to be absorbed within the device
Implementation Method 3
an inverted organic PV device comprising a reflective electrode
Data Source
AI summary
There is disclosed a method for preparing the surface of a metal substrate. The present disclosure also relates to an organic photovoltaic device including a metal substrate made by such method. Also disclosed herein is an inverted photosensitive device including a stainless steel foil reflective electrode, an organic donor-acceptor heterojunction over the reflective electrode, and a transparent electrode over the donor-acceptor heterojunction.