Naphthyridine Polymer for Solar Cell Charge Transport
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Solution Overview
Problem
Current organic and perovskite solar cells face limitations in achieving high light conversion efficiency due to limited diversity in polymer materials, particularly in electron donor and acceptor repeat units, which affect charge mobility and crystallinity, and the need for novel polymers with broad light absorption and suitable energy levels.
Innovation Solution
A novel polymer with a 1,5-naphthyridine-2,6-dione structure is developed, which can serve as an electron donor in organic solar cells and a hole transport layer in perovskite solar cells, exhibiting high charge mobility and excellent crystallinity, and is represented by specific structural formulas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional polymers with limited monomer types are used, then device structure simplicity is maintained, but material diversity and light conversion efficiency are limited
Solution Approach 1:
The polymer is divided into distinct functional segments: electron donor units (thiophene derivatives with alkyl chains), electron acceptor units (1,5-naphthyridine-2,6-dione core), and side chain components (alkoxy groups). This segmentation allows independent optimization of each functional unit's properties while maintaining overall polymer performance, enabling diverse material combinations without proportionally increasing structural complexity
Solution Approach 2:
The patent creates composite polymer structures by combining electron donor and acceptor units in alternating copolymer configurations. This composite approach integrates multiple material functionalities within a single polymer chain, achieving enhanced light absorption and charge transport properties while maintaining a relatively simple two-component synthetic system
2Reliability
If polymers with high charge mobility are developed, then light conversion efficiency improves, but the range of suitable monomer materials remains limited
Solution Approach 1:
The patent systematically varies key parameters including: alkyl chain length (C8, C10, C12, C14, C16, C18 variants), alkoxy group positions (2-position, 3-position, 4-position substitutions), and electron acceptor core structures (different naphthyridine derivatives). These parameter changes enable tuning of charge mobility while expanding monomer selection diversity through a standardized platform approach
3Use of energy by moving object
If polymers with broad light absorption are designed, then photoelectric conversion efficiency increases, but crystallinity and molecular orientation control becomes more difficult
Solution Approach 1:
The patent applies local quality modifications by introducing specific functional groups at predetermined positions: electron-withdrawing alkoxy groups at 2-position enhance light absorption in specific wavelength regions, while alkyl side chains at defined positions control intermolecular spacing and crystalline packing. This localized functionalization allows independent optimization of optical and structural properties
4Adaptability or versatility
If novel repeat unit materials are introduced, then polymer performance diversity increases, but synthesis complexity and development time increase
Solution Approach 1:
The 1,5-naphthyridine-2,6-dione core structure serves as a universal electron acceptor unit that can be combined with various electron donor units (different thiophene derivatives) through standard polymerization reactions. This universal platform enables diverse polymer performance while maintaining consistent, scalable synthesis methodology across all variants
Solution Approach 2:
The patent employs systematic parameter variation of well-established chemical groups (alkyl chains, alkoxy groups) rather than introducing entirely new chemical structures. This approach achieves polymer performance diversity through controlled modification of existing functional units, maintaining compatibility with conventional polymerization techniques and simplifying scale-up
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 polymer achieves high light conversion efficiency and extended service life for perovskite solar cells without additives, with light absorption coefficients exceeding 1×10^5 cm^-1 and hole mobility of 3×10^-3 cm^2 V^-1 s^-1, enhancing the performance of both organic and perovskite solar cells.
Implementation Method 1
the polymer may have a light absorption coefficient of 5×10^4 cm^-1 or more at a maximum light absorption wavelength within wavelengths from 380 nm to 1000 nm
Implementation Method 2
the polymer exhibits high charge mobility and excellent crystallinity, and is represented by specific structural formulas
Data Source
AI summary
The present invention relates to a polymer, an organic solar cell comprising the polymer, and a perovskite solar cell comprising the polymer. The polymer according to the present invention has excellent absorption ability for visible light and an energy level suitable for the use as an electron donor compound in a photo-active layer of the organic solar cell, thereby increasing the light conversion efficiency of the organic solar cell. In addition, the polymer according to the present invention has high hole mobility, and is used as a compound for a hole transport layer, and thus can improve efficiency and service life of the perovskite solar cell without an additive.