Logically Design Tailor-made Polymer Additives Towards Achieving Highly Stable and Efficient Perovskite Solar Cells
Manipulation of the defective grain boundaries and pinholes in perovskite films is crucial to maximizing optoelectronic properties and stability of the perovskite solar cells (PSCs). It has been found that by introducing polymers to perovskite films, one may improve the crystallinity and morphology of the films. The various functional groups make it possible for the polymers to control over the morphology, passivate the trap states at grain boundaries, and improve carrier mobility. The aim of the study is to design such polymers in order to favour crystallization and reduce the trap states. By using controlled radical polymerization, copolymers will be synthesized which are capable of building hydrogen bonds with perovskite. The resulted PSCs are expected to be a part of the solution for obtaining highly stable and efficient solar cells.
Status: Ongoing
Date of proposal: 03/12/2021
Start date: 04/04/2022
End Date: 29/04/2022
Used Instruments: Spin-coater and hot-plate. Thermal evaporation system. Solar simulator. PICOQUANT time-resolved PL.
Experimental Technique: Fabrication of perovskite solar cells (PSCs) with polymer additives. Photoluminescence (PL) and time-resolved photoluminescence (TRPL) measurements.
Experiment Description: The study focused on designing tailor-made polymer additives to enhance the stability and efficiency of PSCs. Experimentation included the integration of polymers into the perovskite layer during the fabrication process.
Type Samples: Perovskite solar cells with various polymer additives.
Sample Description: PSCs fabricated with additives such as PMMA (poly(methyl methacrylate)) and PDMAEMA (poly(2-Dimethylaminoethyl) methacrylate), and their copolymers.
Experiment Data Type: Photovoltaic parameters (Jsc, Voc, FF, PCE). Photoluminescence and time-resolved photoluminescence data.
Characterization Technics: Photovoltaic performance testing. PL and TRPL for studying defects in films.
Characterization Data Type: Performance data of PSCs with and without polymer additives. PL and TRPL data indicating the presence of defects and crystallinity.
Analyzed Data: Impact of polymer additives on PSC performance. Analysis of defects and crystallinity in polymer-incorporated PSCs.
Main Targets Project: Developing polymer additives to enhance PSC stability and efficiency. Understanding the effect of different polymer structures on PSC performance.
Main Achievements Findings: PMMA showed the most positive impact on PSC performance among tested polymers. PDMAEMA decreased film quality and device performance, indicating a need for further study. Copolymer2 (rich in MMA segments) showed similar performance to PMMA-incorporated devices.