Interplay of optoelectronic properties and solar cell performance in multidimensional perovskites

Perovskite is an emerging material for photovoltaic application that has reached 22.7% efficiency to date. Despite its excellent properties such as defect tolerance and long carrier lifetime, the high-performing perovskite material, methylammonium lead iodide (MAPI), which has 3D structure, is still unstable. Recent studies have hinted at the possibility of shifting focus from 3D to lower dimensional perovskite structures because lower dimensional structures are more environmentally stable for a longer period than the 3D analogues. We propose a detailed study where PbI₂ is used as the backbone and A-site cations are alloyed with various combinations: methylammonium, dimethylammonium, iso-propylammonium, and t-butylammonium. We measure the perovskite solar cell devices' performance and characterize the solar absorber to understand the optoelectronic properties. It is shown that the addition of large A-site cations change the structures into lower dimension, which increases the bandgap and decreases device performance properties such as efficiency, open-circuit voltage, and short-circuit current. Hence, there is a trade-off between having more stable perovskite and high-performance cell in using large A-site organic cations.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2018

Author dc:creator

• Hartono, Noor Titan Putri

Advisor dc:contributor.advisor

• Tonio Buonassisi.

• Mechanical Engineering.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/118669

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/118669