Perovskite Solar Cell Composition for Heat-Resistant Efficiency
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Solution Overview
Problem
Current solar cells, particularly inorganic solar cells, face challenges with high production costs and difficulty in upscaling, while organic and organic-inorganic perovskite solar cells aim to improve photoelectric conversion efficiency but often lack heat resistance.
Innovation Solution
Incorporating an organic-inorganic perovskite compound with an acidic polymer having an acid dissociation constant pKa of 3 or less into the photoelectric conversion layer, which enhances electron mobility and stability, allowing for high photoelectric conversion efficiency and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inorganic semiconductors are used to produce solar cells, then production cost is reduced and upscaling is enabled, but photoelectric conversion efficiency and heat resistance deteriorate
Solution Approach 1:
The patent uses a composite material system combining organic-inorganic perovskite compound (CH3NH3PbI3) with polymer matrix (PVDF or PVDF-HF). This composite structure integrates the high photoelectric conversion efficiency of perovskite with the heat resistance and structural stability of the polymer matrix, resolving the contradiction between efficiency and thermal stability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the photoelectric conversion layer by incorporating fluorinated polymers (PVDF-HF) and optimizing the perovskite compound formulation. These parameter changes enhance both the photoelectric conversion efficiency and the thermal stability of the solar cell simultaneously.
2Reliability
If organic-inorganic perovskite compounds are used to improve photoelectric conversion efficiency, then efficiency is improved, but heat resistance deteriorates
Solution Approach 1:
The patent creates a composite photoelectric conversion layer where organic-inorganic perovskite compounds are embedded in a fluorinated polymer matrix (PVDF-HF). The polymer matrix provides thermal stability and structural integrity at elevated temperatures, while the perovskite compound maintains high photoelectric conversion efficiency, thus resolving the heat resistance problem.
Solution Approach 2:
The fluorinated polymer (PVDF-HF) acts as an intermediary material between the perovskite compound and the environment. It protects the thermally sensitive perovskite from direct thermal exposure while maintaining its photoelectric properties, thereby improving the overall heat resistance of the solar cell.
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 combination of organic-inorganic perovskite compounds with acidic polymers improves photoelectric conversion efficiency and provides high heat resistance, making the solar cells more effective and durable.
Implementation Method 1
Such solar cells generate photocarriers (electron-hole pairs) by photoexcitation
Data Source
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Figure 3
AI summary
The present invention aims to provide a solar cell that includes a photoelectric conversion layer containing an organic-inorganic perovskite compound and that can exhibit high photoelectric conversion efficiency and high heat resistance. Provided is a solar cell including, in the stated order: a cathode; a photoelectric conversion layer; and an anode, the photoelectric conversion layer containing an organic-inorganic perovskite compound represented by the formula R-M-X3 where R is an organic molecule, M is a metal atom, and X is a halogen atom or a chalcogen atom, and a polymer having an acid dissociation constant pKa of 3 or less.