Precursor, perovskite light-absorbing layer and preparation method thereof, perovskite battery, and electric device
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Solution Overview
Problem
The intrinsic defects in lead-tin mixed perovskite batteries, such as Sn2+ oxidation to Sn4+, tin vacancy defects, and uneven crystal grain distribution, deteriorate the photoelectric conversion efficiency and stability of perovskite batteries.
Innovation Solution
Incorporating organic additives with functional groups like —OH and —NH2 into the perovskite precursor solution to interact strongly with the tin-based component, suppressing impurities and reducing crystallization rates, resulting in a high-quality perovskite light-absorbing layer without holes and wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-tin mixed perovskite is used to reduce pollution, then environmental friendliness is improved, but intrinsic defects (Sn2+ oxidation, tin vacancies, uneven crystal grain distribution) increase
Solution Approach 1:
An organic additive is introduced as an intermediary substance between the tin-based perovskite precursor and the final perovskite structure. This additive interacts strongly with the tin-based component during the formation process, mediating the crystallization to suppress Sn2+ oxidation, reduce tin vacancies, and promote uniform crystal grain distribution, thereby resolving the contradiction between environmental friendliness and reliability
Solution Approach 2:
The organic additive is incorporated into the perovskite precursor solution before the perovskite formation process. This preliminary action allows the additive to be present during the critical early stages of crystallization, where it can prevent defect formation (Sn2+ oxidation, tin vacancies) before they occur, leading to improved photoelectric conversion efficiency and stability in the final product
2Object-affected harmful factors
If tin-based perovskite component is introduced to replace lead, then environmental stability is improved, but crystallization defects and uneven crystal grain distribution occur
Solution Approach 1:
The organic additive serves as a mediator during the crystallization process, interacting with the tin-based component to regulate crystal growth. This mediation ensures uniform crystal grain distribution by preventing premature or uneven crystallization, thereby improving manufacturing precision while maintaining the environmental benefits of tin-based perovskite
Solution Approach 2:
The organic additive modifies the crystallization parameters of the tin-based perovskite component, including crystal growth rate and nucleation behavior. By changing these parameters, the additive promotes uniform crystal grain distribution and reduces crystallization defects, resolving the contradiction between environmental stability and manufacturing precision
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 solution improves the photoelectric conversion efficiency and stability of perovskite batteries by alleviating defects and enhancing film quality, thereby prolonging the service life and broadening application prospects.
Implementation Method 1
the organic additive including one or more functional groups of the carboxyl group, the hydroxyl group, and the amino group interacts strongly with the tin-based component in the lead-tin mixed perovskite precursor, suppressing impurities in the intermediate phase
Data Source
AI summary
A precursor, a perovskite light-absorbing layer and preparation method thereof, a perovskite battery, and an electric device are described. The precursor is used for preparing a perovskite light-absorbing layer and includes a perovskite precursor solution and an organic additive added to the perovskite precursor solution, where the organic additive includes one or more functional groups of a carboxyl group, a hydroxyl group, and an amino group. In this application, the organic additive including one or more functional groups of the carboxyl group, the hydroxyl group, and the amino group is added to the perovskite precursor solution, alleviating problems such as a crystallization defect and uneven crystal grain distribution of a perovskite component in the process of the perovskite precursor solution forming perovskite, thereby improving the photoelectric conversion efficiency and stability of the perovskite battery.