| Full text | |
| Author(s): |
Szostak, R.
[1, 2]
;
Silva, J. C.
[2]
;
Turren-Cruz, S. -H.
[3]
;
Soares, M. M.
[1]
;
Freitas, R. O.
[1]
;
Hagfeldt, A.
[4]
;
Tolentino, H. C. N.
[1]
;
Nogueira, A. F.
[2]
Total Authors: 8
|
| Affiliation: | [1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[2] Univ Campinas UNICAMP, Lab Nanotecnol & Energia Solar, Chem Inst, POB 6154, BR-13083970 Campinas, SP - Brazil
[3] Helmholtz Zentrum Berlin Materlialien & Energie, Kekulestr 5, D-12489 Berlin - Germany
[4] Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Lab Photomol Sci, CH-1015 Lausanne - Switzerland
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | SCIENCE ADVANCES; v. 5, n. 10 OCT 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
Lead-based organic-inorganic hybrid perovskite (OIHP) solar cells can attain efficiencies over 20%. However, the impact of ion mobility and/or organic depletion, structural changes, and segregation under operating conditions urge for decisive and more accurate investigations. Hence, the development of analytical tools for accessing the grain-to-grain OIHP chemistry is of great relevance. Here, we used synchrotron infrared nanospectroscopy (nano-FTIR) to map individual nanograins in OIHP films. Our results reveal a spatial heterogeneity of the vibrational activity associated to the nanoscale chemical diversity of isolated grains. It was possible to map the chemistry of individual grains in CsFAMA {[}Cs(0.05)FA(0.79)MA(0.16)Pb(I0.83Br0.17)(3)] and FAMA {[}FA(0.83)MA(0.17)Pb(I0.83Br0.17)(3)] films, with information on their local composition. Nanograins with stronger nano-FTIR activity in CsFAMA and FAMA films can be assigned to PbI2 and hexagonal polytype phases, respectively. The analysis herein can be extended to any OIHP films where organic cation depletion/accumulation can be used as a chemical label to study composition. (AU) | |
| FAPESP's process: | 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 17/12582-5 - Perovskites with mixed cations: Relationship between structure, composition, electronic properties and efficiency of solar cells |
| Grantee: | Rodrigo Szostak |
| Support Opportunities: | Scholarships in Brazil - Doctorate |