DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 61: Perovskite and photovoltaics III (joint session HL/CPP)

CPP 61.5: Vortrag

Mittwoch, 18. März 2020, 10:30–10:45, POT 251

How does strain impact the solar cell performance at grain boundaries? — •Michael Stuckelberger1, Irene Calvo-Almazán2, Martin Holt2, Megan Hill3, Siddharth Maddali2, Mariana Bertoni4, Xiaojing Huang5, Hanfei Yan5, Evgeny Nazaretski5, Yong Chu5, Andrew Ulvestad2, and Stephan Hruszkewycz21DESY, Hamburg, Germany — 2ANL, Lemont IL, USA — 3Northwestern University, Evanston IL, USA — 4ASU, Tempe AZ, USA — 5BNL, Upton NY, USA

Grain boundaries (GB) often limit the conversion efficiency of polycrystalline solar cells. Strain is particularly detrimental there, as it enhances the defect concentration and band fluctuations, leading to increased recombination rates. Unfortunately, standard methods cannot easily measure the strain distribution in working thin-film devices.

Based on nanodiffraction experiments, we demonstrate the assessment of the strain distribution at sub-100-nm resolution. In a multimodal detector design, we combined nanodiffraction with X-ray fluorescence (XRF) and X-ray beam induced current (XBIC) measurements. Mapping individual grains, this enabled us to correlate point-by-point the strain with composition and performance within grains and at GB.

In CIGS solar cells, we found that the strain increases towards GB, which is accompanied by an increase of the charge collection efficiency. In contrast, we found a decreasing lattice constant towards GB in CdTe solar cells. Similar correlative experiments are ongoing on perovskite solar cells, and we will present the latest results.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden