Charge carrier decay and diffusion in organic–inorganic CH3NH3PbI3–xClx perovskite based solar cell. Issue 12 (12th November 2015)

• Record Type: Journal Article
• Authors: Petrović, Miloš; Chellappan, Vijila; Ye, Tao; Ramakrishna, Seeram
• Is Part Of: Physica status solidi. Volume 9:Issue 12(2015:Dec.)
• Page Start: 682
• Page End: 686
• Publication Date: 2015-11-12
• Subjects: perovskites -- solar cells -- transient photovoltage -- transient photocurrent -- charge carrier lifetime -- charge carrier diffusion; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201510389
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : In recent years, organic–inorganic lead halides attracted widespread interest, mainly due to their impressive photoconversion properties and low‐cost solution processing. In this study, we employed small amplitude transient photovoltage and photocurrent spectroscopy to investigate charge transport and recombination properties of perovskite CH3 NH3 PbI3– x Cl x solar cell under realistic light harvesting conditions (<1 sun). Cell structure resembles outlay commonly found in organic photovoltaics, with perovskite absorber being sandwiched between two thin layers of organic polymers. Tested device displayed high power conversion efficiency (10.3%), good fill factor and negligible hysteresis effect. Fundamental device parameters were characterized at various open‐circuit voltages ( V oc ) by examination of small voltage and current perturbations created by the low intensity pulsed laser excitations. The obtained results exhibit long charge carrier lifetimes and fast charge transport over the full range of applied optical bias, as well as remarkable diffusion lengths exceeding 1 μm. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) Abstract : Fundamental parameters necessary for understanding photophysics of organic–inorganic perovskite solar cells with organic transporting layers were tested under ambient conditions corresponding to realistic conditions encountered during outdoors conversion. Device behaviour mapped during its operation revealed long carrier lifetimes and fast charge transport, proving that lead halide perovskites are a viable option for "real‐life" light harvesting applications.