Ultrafast polarization control of zero-bias photocurrent and terahertz emission in hybrid organic perovskites

Abstract

Methylammonium lead iodide (MAPI) is a benchmark hybrid organic perovskite material, which is used for the low-cost, printed solar cells with over 20 percent power conversion efficiency. Yet, the nature of light-matter interaction in MAPI as well as the exact physical mechanism behind device operation is currently debated. Here we report room temperature, ultrafast photocurrent and freespace terahertz (THz) emission generation from unbiased MAPI induced by 150 fs light pulses. Polarization dependence of the observed photoresponse is consistent with the Bulk Photovoltaic Effect (BPVE) caused by a combination of injection and shift currents. We believe that this observation of can shed light on low recombination, and long carrier diffusion lengths due to indirect bandgap. Moreover, ballistic by nature shift and injection BPVE photocurrents may enable third generation perovskite solar cells with efficiency that exceed the Shockley_Queisser limit. Our observations also open new venues for perovskite spintronics and tunable THz sources.

arXiv comment11 pages, 3 figures

References in corpus (7)

• Control over topological insulator photocurrents with light polarization
• Hidden spin polarization in inversion-symmetric bulk crystals
• High frequency electric field induced nonlinear effects in graphene (review)
• Generation and Electric Control of Spin-Coupled Valley Current in WSe2
• Ultrafast photocurrents at the surface of the three-dimensional topological insulator ${\mathrm{Bi}}_2{\mathrm{Se}}_3$
• Circular photon drag effect in bulk tellurium
• Circular Photogalvanic Effect in Organometal Halide Perovskite CH${}_3$NH${}_3$PbI${}_3$

Cited by in corpus (1)

• Spin-split bands cause the indirect band gap of (CH${}_3$NH${}_3$)PbI${}_3$: Experimental evidence from circular photogalvanic effect