Multijunction Organic Photovoltaic Cells for Efficiency and Lifetime

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Solution Overview

Problem

Organic photovoltaic cells (OPVs) face a need to improve efficiency and lifetime, particularly in addressing the efficiency gap between OPVs and other thin film technologies, by eliminating the source of excess loss in the photogeneration process through novel multijunction designs.

Innovation Solution

Implementing a multijunction design with a first and second arrangement of at least one OPV cells, and a second arrangement of at least one OPV cells, and a second arrangement of at least one OPV device, wherein the first and second substrates are connected in parallel and/or series, and/or series, and a second arrangement of at least one OPV cells, with balanced operating voltages and transparent properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional single-junction OPV design is used, then device simplicity is maintained, but power conversion efficiency remains below 20%

Engineering Contradiction:

Improvepower conversion efficiencyVSAvoiddevice structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent divides the single photovoltaic junction into multiple independent photovoltaic cells with different bandgaps, where each cell absorbs a specific portion of the solar spectrum. This segmentation allows the system to capture a broader range of photons and convert them to electricity, achieving over 20% power conversion efficiency while maintaining relatively simple individual cell structures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a single-junction planar design to a multi-junction stacked architecture, adding the dimension of vertical layering with different bandgap materials. This dimensional change enables simultaneous absorption of high-energy and low-energy photons across the solar spectrum, significantly improving energy conversion efficiency without complicating the fundamental photovoltaic mechanism.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If multijunction design is implemented to improve efficiency, then power conversion efficiency exceeds 20%, but device complexity increases

Engineering Contradiction:

Improvepower conversion efficiencyVSAvoiddevice structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent systematically varies the bandgap parameter across different photovoltaic cells in the multijunction structure, with each cell having a specifically optimized bandgap value to absorb particular wavelength ranges. This parameter optimization enables maximum spectral utilization and power conversion efficiency while maintaining manageable device complexity through controlled material selection.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If conventional OPV materials are used, then cost-effectiveness is maintained, but efficiency gap with other thin film technologies persists

Engineering Contradiction:

Improveefficiency gapVSAvoidproduction cost

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent employs composite material structures combining organic photovoltaic materials with inorganic components in the multijunction architecture. This composite approach leverages the advantages of both material classes - the flexibility and low-cost processing of organics with the high efficiency of inorganic thin films - thereby closing the efficiency gap with competing technologies while maintaining cost-effectiveness and ease of manufacture.

Inventive Principle:

Principle #40Composite materials

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 multijunction design achieves efficiencies exceeding 22%, and the efficacy is demonstrated in enhancing the power conversion efficiencies and operational lifetime, overcoming the limitations of existing technologies.

Implementation Method 1

Photosensitive optoelectronic devices convert electromagnetic radiation into electricity. Solar cells, also called photovoltaic (PV) devices or cells, are a type of photosensitive optoelectronic device that is specifically used to generate electrical power.

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS20260006979A1Organic optoelectronic devices and materials with increased efficiency and lifetime

Publication Date: 2026.01.01 THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

AI summary

An organic photovoltaic (OPV) device comprises a first arrangement of at least one OPV cell, and a second arrangement of at least one OPV cell, wherein the first and second arrangements are connected in parallel. An organic photovoltaic device comprises a substrate, a first and second electrodes above the substrate, and a heterojunction between the electrodes, comprising a first and second regions, wherein at least a portion of the heterojunction is lightly doped, wherein a conductivity dopant is covalently tied to a host within the first or second regions.