Photoluminescence and Time Resolved Photoluminescence of Organic-inorganic Halide Perovskites
ORAL
Abstract
Organic-inorganic halide perovskites (OIHP), where perovskites layers are separated by organic spacers, can be engineered to have photoluminescence (PL) emissions from UV to IR regions, in addition to power conversion efficiencies of more than 24%. This class of materials offers broad tunability through controlling the number of atomic layers in the quantum well via perovskite composition and the spacer thickness depending on what organic groups are incorporated. In this work we present PL and time resolved PL (TRPL) measurements of these materials as a function of temperature and magnetic field, including: BA2PbI4, BA2MA1Pb2I7, and BA2CuCI4 where BA2 represents (CH3(CH2)3NH3)2, and MA: CH3NH3. Both BA2PbI4 and BA2CuCI4 have a single layer of perovskite material separated by an organic cation layer while BA2MA1Pb2I7 has two atomic layers of perovskite. Our observations indicate the existense of both free and trapped excitons.
*This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-17-1-0341 and DURIP funding (FA9550-16-1-0358). A portion of this work was performed at the National High Magnetic Field Laboratory, supported by the NSF Agreement No. DMR-11574 90 and the State of Florida.
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Presenters
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Giti Khodaparast
- Virginia Tech
- Physics, Virginia Tech