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Interface Energy Alignment between Lead Halide Perovskite Single Crystals and TIPS-Pentacene.
Alberto García-Fernández1, Birgit Kammlander1, Stefania Riva2
1Division of Applied Physical Chemistry, Department of Chemistry, KTH - Royal Institute of Technology, Stockholm100 44, Sweden.
Inorganic Chemistry
|September 15, 2023
Summary
Investigating interfaces of organic semiconductors with lead halide perovskites using X-ray photoelectron spectroscopy reveals energy level shifts in TIPS-pentacene. These shifts, interpreted as band bending, are crucial for understanding charge transport in optoelectronic devices.
Area of Science:
- Materials Science
- Solid State Physics
- Surface Science
Background:
- Lead halide perovskites are crucial for optoelectronic applications.
- Device performance heavily relies on charge transport across interfaces.
- Understanding interfacial electronic structure is vital for optimizing perovskite-based devices.
Purpose of the Study:
- To investigate the interfacial energetics between TIPS-pentacene and various lead halide perovskite single crystals.
- To explore the influence of TIPS-pentacene thickness on interfacial electronic structure.
- To analyze the impact of different perovskite compositions on interfacial properties.
Main Methods:
- High-resolution soft X-ray photoelectron spectroscopy (XPS) utilizing synchrotron radiation.
- Ultrahigh vacuum (UHV) studies of in situ formed interfaces.
- Analysis of TIPS-pentacene/perovskite interfaces with varying thicknesses and perovskite compositions (MAPbI3, MAPbBr3, FAPbBr3, Cs0.05FA0.95Pb(Br0.5I0.5)3).
Main Results:
- A significant shift of TIPS-pentacene energy levels towards higher binding energies was observed with increasing thickness.
- Perovskite energy levels remained largely unaffected by TIPS-pentacene overlayer or composition.
- Band bending in the TIPS-pentacene layer was identified as the cause of the observed energy level shifts.
- Surface reconstruction on MAPbI3 was detected, evidenced by the transformation of surface C 1s to bulk C 1s.
Conclusions:
- The observed band bending in TIPS-pentacene is a critical factor for energy level alignment at perovskite/organic interfaces.
- These findings necessitate consideration of such interfacial effects for designing efficient perovskite-based optoelectronic devices.
- The study highlights the importance of in situ surface characterization for understanding complex interfacial phenomena.
