Spatial–temporal spectroscopy characterizations and electronic structure of methylammonium perovskites

Liu, Zhaoyu; Bhamu, K. C.; Luo, Liang; Shah, Satvik; Park, Joong -Mok; Cheng, Di; Long, Men; Biswas, Rana; Fungara, F.; Shinar, Ruth; Shinar, Joseph; Vela, Javier; Wang, Jigang

doi:10.1557/mrc.2018.114

Title: Spatial–temporal spectroscopy characterizations and electronic structure of methylammonium perovskites

Journal Article · Mon Jul 09 00:00:00 EDT 2018 · MRS Communications

DOI:https://doi.org/10.1557/mrc.2018.114· OSTI ID:1461658

Liu, Zhaoyu ^[1]; Bhamu, K. C. ^[2]; Luo, Liang ^[1]; Shah, Satvik ^[3]; Park, Joong -Mok ^[1]; Cheng, Di ^[1]; Long, Men ^[1];

^[1]; Fungara, F. ^[1]; Shinar, Ruth ^[3]; Shinar, Joseph ^[1]; Vela, Javier ^[1]; Wang, Jigang ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
CSIR-National Chemical Lab., Maharashtra (India)
Iowa State Univ., Ames, IA (United States)

Using time-resolved laser-scanning confocal microscopy and ultrafast optical pump/THz probe spectroscopy, we measure photoluminescence (PL) and THz-conductivity in perovskite micro-crystals and films. PL quenching and lifetime variations occur from local heterogeneity. Ultrafast THz-spectra measure sharp quantum transitions from excitonic Rydberg states, providing weakly bound excitons with a binding energy of ~13.5 meV at low temperatures. Ab-initio electronic structure calculations give a direct band gap of 1.64 eV, a dielectric constant of ~18, heavy electrons, and light holes, resulting in weakly bound excitons, consistent with the binding energies from the experiment. Here, the complementary spectroscopy and simulations reveal fundamental insights into perovskite light-matter interactions.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 61771402; 61505164; 11674266; 11372248; 51575297; AC02-07CH11358

OSTI ID:: 1461658

Report Number(s):: IS-J-9714; PII: S2159685918001143

Journal Information:: MRS Communications, Vol. 10, Issue 25; ISSN 2159-6859

Publisher:: Materials Research Society - Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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