Influence of Charge Transport and Defects on the Performance of Planar and Mesostructured Perovskite Solar Cells. Issue 13 (17th February 2017)

• Record Type: Journal Article
• Authors: Petrović, Miloš; Ye, Tao; Vijila, Chellappan; Ramakrishna, Seeram
• Is Part Of: Advanced energy materials. Volume 7:Issue 13(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-02-17
• Subjects: charge transport -- mobility -- perovskites -- photo‐CELIV -- traps; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201602610
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract : Photoinduced charge selective carrier extraction by linearly increasing voltage technique allows straightforward assessment of charge transport properties within planar and mesostructured perovskite solar cells with respect to light intensity and signal delay time. Charge sensitive device architecture is realized through implementation of insulating layer between the anode or cathode to prevent extraction of unwanted type of carriers. Resulting behavior of comparatively efficient mesoporous and planar solar cells exhibits well balanced charge transport with slight dependence of charge mobility on applied laser pulse fluence, for given pulse delay times. Very similar charge carrier mobilities are present within mesoporous devices, whereas holes trail approximately half an order of magnitude behind electrons in planar structured specimens. Moreover, dispersive transport is identified in the electron selective devices with titanium oxide electron transporter, suggesting considerable presence of trapping states at the perovskite interface, whereas no such behavior characterizes planar samples. Variation in delay time between laser pulse and extraction ramp only affects initial charge concentration present within the device, while transient outlay remains unchanged, indicating absence of film charging effect. Abstract : Charge selective extraction of photogenerated carriers by linearly increasing voltage is used to characterize planar and mesostructured perovskite solar cells. Inclusion of insulating layer into device structure prevents collection of unwanted carriers at corresponding electrode, provides valuable insight into charge transfer properties and pinpoints critical part of device responsible for trapping disorders.