Polymer solar batteries, understood for their lightweight and versatility, are perfect for wearable gadgets. Yet, their wider usage is prevented by the poisonous halogenated solvents needed in their production. These solvents present ecological and health dangers, restricting the appeal of these solar batteries. Alternative solvents, which are less poisonous, regrettably, do not have the exact same solubility, demanding greater temperature levels and extended processing times.
This ineffectiveness even more restrains the adoption of polymer solar batteries. Establishing a technique to remove the requirement for halogenated solvents might considerably boost the performance of natural solar batteries, making them preferable for wearable innovation.
In a just recently released paper, scientists lay out how enhancing molecular interactions in between the polymer donors and the little particle acceptors utilizing side-chain engineering can decrease the requirement for halogenated processing solvents.
The paper was just recently released in Nano Research Study Energy.
” Mix morphology of polymer donors and little particle acceptors are extremely impacted by their molecular interactions, which can be identified by interfacial energies in between the donor and acceptor products. When their surface area stress worths are comparable, the interfacial energies and molecular interactions in between the donors and the acceptors are anticipated to be more beneficial,” stated Yun-Hi Kim, a teacher at Gyeongsang National University in Jinju, Republic of Korea. “To boost the hydrophilicity of the polymer donors and decrease molecular demixing, side-chain engineering can be a possible opportunity.”
The Function of Side-Chain Engineering
Side-chain engineering is when a chemical group, called a side chain, is contributed to the primary chain of a particle. The chemical groups in the side chain impact the residential or commercial properties of the bigger particle. Scientist thought that including oligoethylene glycol (OEG)- based side chains would enhance the hydrophilicity of the polymer donors thanks to the oxygen atoms in the side chains. A particle with hydrophilicity is brought in to water.
Distinctions in the hydrophilicity of the polymer donors and the little particle acceptors can affect how they engage. With increased hydrophilicity of the polymer donors and enhanced interactions in between them and the little particle acceptors, non-halogenated processing solvents can be utilized without compromising the efficiency of the solar battery. In reality, polymer solar batteries made with OEG-based side chains connected to a benzodithiophene-based polymer donor had a greater power conversion performance at 17.7% compared to 15.6%.
Improved Performance and Stability
In order to compare outcomes, scientists created benzodithiophene-based polymer donors with either an OEG side chain, hydrocarbon side chains, or side chains that were 50% hydrocarbon and 50% OEG. “This illuminated the impact of side-chain engineering on mix morphology and efficiency of non-halogenated solvent-processed polymer solar batteries,” stated Kim. “Our findings show that polymers with hydrophilic OEG side chains can boost the miscibility with little particle acceptors and enhance power conversion performance and gadget stability of polymer solar batteries throughout non-halogenated processing.”
In addition to enhanced power conversion performance, the polymer solar batteries with the OEG-based side chains had actually improved thermal stability. Thermal stability is necessary for scaling polymer solar batteries, so scientists warmed them to 120 degreesand after that compared the power conversion performance. After 120 hours of heating, the polymers with the hydrocarbon side chains had just 60% of their preliminary power conversion performance and had abnormalities on their surface area, while the mix of hydrocarbon and OEG maintained 84% of their preliminary power conversion performance.
” Our outcomes can supply a helpful standard for developing polymer donors that produce effective and steady polymer solar batteries utilizing non-halogenated solvent processing,” stated Kim.
Referral: “Polymer donors with hydrophilic side-chains allowing effective and thermally-stable polymer solar batteries by non-halogenated solvent processing” by Soodeok Seo, Jun-Young Park, Jin Su Park, Seungjin Lee, Do-Yeong Choi, Yun-Hi Kim and Bumjoon J. Kim, 24 July 2023, Nano Research Study Energy
DOI: 10.26599/ NRE.2023.9120088
Other factors consist of Soodeok Seo, Jin Su Park, and Bumjoon J. Kim of the Korea Advanced Institute of Science and Innovation; Jun-Young Park and Do-Yeong Choi of Gyeongsang National University; and Seungjin Lee of the Korea Research Study Institute of Chemical Innovation.
The Korea Institute of Energy Examination and Preparation and the Korean National Research study Structure moneyed this research study.