Diffusion and photon recycling in halide perovskite thin films: insights from experiment and theory

A. Sridharan; Nakita K. Noel; Barry P. Rand; Stéphane Kéna-Cohen

doi:10.1117/12.2567375

20 August 2020 Diffusion and photon recycling in halide perovskite thin films: insights from experiment and theory

A. Sridharan, Nakita K. Noel, Barry P. Rand, Stéphane Kéna-Cohen

Proceedings Volume 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX; 114640J (2020) https://doi.org/10.1117/12.2567375
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

Hybrid inorganic-organic perovskites stand out as unique photovoltaic materials due to their exceptional optical and electronic properties. Here, we study in-plane carrier diffusion in perovskite thin films via time-resolved imaging of the photoluminescence from a diffraction-limited spot. Fitting to a 3D diffusion model allows extraction of both diffusion and recombination coefficients. Our results show two regimes of carrier diffusion, with a very rapid spreading large D = (0.968 ± 0.003) cm²s^-1 observed at short times, within a measurement window of ~1 ns, and a much smaller D = (7 ± 1) × 10^-3 cm²s^-1 in a window of 200 ns. To investigate the rapid spreading at short times, we explicitly consider the effect of photon recycling within the plane of the film. We find that photon recycling has a negligible impact on such measurements, with the exception of a small increase in the intensity of the tails of the luminescence spot.

Conference Presentation

Citation Download Citation

A. Sridharan, Nakita K. Noel, Barry P. Rand, and Stéphane Kéna-Cohen "Diffusion and photon recycling in halide perovskite thin films: insights from experiment and theory", Proc. SPIE 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX, 114640J (20 August 2020); https://doi.org/10.1117/12.2567375

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available