Mixed cation inks for Perovskite solar cells: Towards scale up

Mixed cation inks for Perovskite solar cells: Towards scale up

Ramakrishna, V.

Böttger, A.J. (mentor)

Mechanical, Maritime and Materials Engineering

Materials Science and Engineering

2017-03-29

This project deals with the crystallographic, performance and optimization study of mixed-cation perovskite inks for large scale solar cell production. After coating these inks on a scale-up compatible planar selective electron transport layer, the crystallographic, optical, and electrical properties of these inks were studied and compared to the Solliance baseline perovskite, a Iodide-Chloride based Methylammonium ink. Currently, the main inks used in Perovskite solar cells (PSC) research are Methylammonium (MA)- (MAPbI3 was the first perovskite to be used for solar cell purposes) and Formamidinium (FA)- based perovskites, because of the ease at which their bandgaps can be tuned by changing their compositions. However, MA- based perovskites have been shown to be less than ideal for future scale up purposes due to their instability when exposed to humidity in the atmosphere, and FA-perovskites are inherently unstable as the crystal structure prefers to relax into a non-perovskite phase after crystallisation. This has paved way for research into hybrid perovskites where the crystal structure is engineered by mixing the different cations to “arrest” it in the active perovskite phase, and prevent it from phase-transforming into the inactive phase. Based on literature, two possible candidate inks were chosen and studied for their high stability and performances: FA0.85MA0.15¬PbI2.5Br0.5 and the triple cation Cs0.05(FA0.85MA0.15)0.95¬PbI2.5Br0.5.

Thin films
Organometal halide Perovskites
Solar cells

http://resolver.tudelft.nl/uuid:d56bdddf-bdfd-42c1-86bb-b1102b0a91ca

2018-03-29

Student theses

master thesis

(c) 2017 V. Ramakrishna