December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
EL04.20.01

Mixing Chalcogenides into Halide Perovskites

When and Where

Dec 6, 2024
10:30am - 11:00am
Hynes, Level 1, Room 102

Presenter(s)

Co-Author(s)

Hemamala Karunadasa1,Jiayi Li1,Santanu Saha2,Zhihengyu Chen3,Yang Wang4,Jeffrey Reimer4,Karena Chapman3,Marina Filip2

Stanford University1,University of Oxford2,Stony Brook University, The State University of New York3,University of California, Berkeley4

Abstract

Hemamala Karunadasa1,Jiayi Li1,Santanu Saha2,Zhihengyu Chen3,Yang Wang4,Jeffrey Reimer4,Karena Chapman3,Marina Filip2

Stanford University1,University of Oxford2,Stony Brook University, The State University of New York3,University of California, Berkeley4
The bandgaps of 3D lead-halide perovskites are dramatically varied by changing the halide. As the electronegativity of the halide decreases, so does the bandgap, leading to gaps that are suitable for absorbing sunlight in a solar cell. Unfortunately, the stability of halide perovskites also decreases as we move to the larger and less electronegative halides, like iodides. We recently found a way to circumvent this dichotomy by mixing organochalcogenides (RS-; R = organic group) with halides in perovskites. We can now access the higher stability of bromide or chloride perovskites, while the chalcogen (S, Se) orbitals form the highest-energy filled electronic bands, affording lower bandgaps than pure-bromide or -chloride perovskites. I will present our latest findings on how mixing halides and chalcogenides can tune the bandgap of the perovskites, in the ideal range for various photovoltaic applications. I will discuss the potential, as well as the remaining challenges, for extracting photocurrent from this new family of perovskites that may combine the properties of lead-halide and lead-chalcogenide solar absorbers.

Keywords

x-ray diffraction (XRD)

Symposium Organizers

Anita Ho-Baillie, The University of Sydney
Marina Leite, University of California, Davis
Nakita Noel, University of Oxford
Laura Schelhas, National Renewable Energy Laboratory

Symposium Support

Bronze
APL Materials

Session Chairs

Nicky Evans
Shaun Tan

In this Session