Squaraine Donor Additive Expands Organic PV Absorption
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Solution Overview
Problem
Current organic photovoltaic cells face challenges in achieving high power conversion efficiency due to limited absorption range and stability issues, with traditional silicon-based devices being expensive and inefficient, while organic PVs struggle to extend sensitivity into the near-infrared spectral region and maintain high efficiency.
Innovation Solution
The use of a donor mixture comprising at least one organic polymer donor material and one squaraine donor expands the absorption range of organic photosensitive optoelectronic devices, forming a donor-acceptor heterojunction that enhances short-circuit current density and power conversion efficiency by complementing absorption bands from the visible spectrum into the near-infrared.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional organic polymer donor materials are used in photovoltaic cells, then the device can be manufactured with lower cost and simpler processes, but the absorption range is limited and power conversion efficiency remains low
Solution Approach 1:
The patent combines traditional organic polymer donor materials with squaraine donor additives to create a composite donor system. This composite approach allows the device to maintain the manufacturing advantages of organic polymers while gaining the extended near-infrared absorption capability of squaraine compounds, thereby resolving the contradiction between ease of manufacture and power conversion efficiency.
Solution Approach 2:
The patent modifies the optical parameters of the donor material by introducing squaraine compounds with specific absorption characteristics. This parameter change enables the photovoltaic device to absorb light in the near-infrared region (700-900 nm) where traditional organic polymers are ineffective, thus improving power conversion efficiency without compromising manufacturing simplicity.
2Productivity
If the absorption range is extended into the near-infrared spectral region using squaraine donors, then short-circuit current density and power conversion efficiency increase, but the device complexity increases due to the need for donor mixture formulation
Solution Approach 1:
The squaraine donor acts as an intermediary component that bridges the gap between traditional organic polymer donors and the near-infrared spectral region. By formulating a donor mixture where squaraine compounds work synergistically with polymer donors, the patent achieves extended absorption without requiring complete redesign of the device architecture, thus managing complexity while improving efficiency.
3Productivity
If squaraine donor additives are incorporated to enhance near-infrared absorption, then the short-circuit current density increases, but the series resistance of the device increases
Solution Approach 1:
The patent optimizes the concentration parameter of squaraine donor additives in the donor mixture. By carefully controlling the amount of squaraine compound added, the patent achieves sufficient near-infrared absorption enhancement while minimizing the adverse effect on series resistance. This parameter optimization resolves the contradiction between increasing short-circuit current density and managing energy losses.
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
This approach significantly increases the power conversion efficiency and short-circuit current density by optimizing the absorption range and reducing series resistance, achieving a power conversion efficiency of up to 3.4% with a 20% improvement over traditional organic PVs.
Implementation Method 1
the at least one squaraine donor has a maximum absorptivity at one or more wavelengths, the maximum absorptivity of the at least one squaraine donor being at least twice as large as an absorptivity of the at least one organic polymer donor material at the one or more wavelengths
Implementation Method 2
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
Data Source
AI summary
Disclosed herein are organic photosensitive optoelectronic devices comprising two electrodes in superposed relation, a photoactive region located between the two electrodes, wherein the photoactive region comprises a donor mixture and an organic acceptor material, the donor mixture comprising at least one organic polymer donor material and at least one squaraine donor. Methods of fabricating the organic photosensitive optoelectronic devices are also disclosed.