Journal
ORGANIC ELECTRONICS
Volume 81, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2020.105671
Keywords
Perovskites; Solar cells; Spin-orbit coupling; Organic cation; Photocurrent
Funding
- Air Force Office of Scientific Research (AFOSR) [FA 955015-1-0064]
- AOARD [FA2386-15-1-4104]
- National Science Foundation [NSF-1911659]
- Center for Nanophase Materials Sciences [CNMS2016-279, CNMS2016-R45, CNMS-2019-057]
- China Scholarship Council
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The presence of the heavy elements leads to strong spin-orbit coupling (SOC) in hybrid organic-inorganic perovskites (HOIPs), which plays an important role in the photovoltaic performance of HOIPs by changing the populations between bright and dark states. The organic cation is a critical composition and affects SOC via the interaction with the inorganic cage. In this work, we use magneto-photocurrent measurement to explore the SOC effect upon using mixed organic cations (methylammonium (MA) and formamidinium (FA)) with different dipole moments in Pb based perovskites. Magneto-photocurrent measurements showed that the internal magnetic parameter B-0 is decreased from 402.41 mT to 180.18 mT and 104.58 mT with decreasing the MA/FA ratio. This provides evidence that changing the internal dipole moment by using mixed organic cations can essentially change the SOC in HOIPs. Simultaneously, the photocurrent is increased from 21.46 mA/cm(2) to 22.60 mA/cm(2) and 23.08 mA/cm(2) when the MA/FA ratio is changed from 1:0 to 0.9:0.1 and 0.7:0.3. Above all, our results indicate that the change in SOC by different organic cations can also be a factor affecting the performance of perovskite solar cells.
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