Interface inductive currents and carrier injection in hybrid perovskite single crystals

Interfaces between the absorbing perovskite and transporting layers are gaining attention as the key locus that governs solar cell operation and long term performance. The interplay of ionic and electronic processes, along with the asymmetrical architecture of any solar cell, makes the interpretatio...

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Bibliographic Details
Published in:Applied physics letters 2017-10, Vol.111 (16)
Main Authors: Kovalenko, Alexander, Pospisil, Jan, Krajcovic, Jozef, Weiter, Martin, Guerrero, Antonio, Garcia-Belmonte, Germà
Format: Article
Language:English
Subjects:
Applied physics
Carrier injection
Computer architecture
Crystal structure
Current carriers
Electric contacts
Electrical measurement
Inert atmospheres
Perovskites
Photovoltaic cells
Response time
Single crystals
Solar cells
Ultrasonic testing
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Summary:Interfaces between the absorbing perovskite and transporting layers are gaining attention as the key locus that governs solar cell operation and long term performance. The interplay of ionic and electronic processes, along with the asymmetrical architecture of any solar cell, makes the interpretation of electrical measurements always inconclusive. A strategy to progress in relating electric responses, operating mechanisms, and device architecture relies upon simplifying the probing structure. Macroscopic CH3NH3PbBr3 single crystals with symmetrical contacts are tested by means of long-time current transient and impedance spectroscopy. It is observed that interfaces govern carrier injection to (and extraction from) perovskite layers through an inductive (negative capacitance) mechanism with a response time in the range of ∼ 1 – 100 s under dark conditions and inert atmosphere. Current transient exhibits a slow recovering after the occurrence of an undershoot, signaling a complex carrier dynamics which involves changes in surface state occupancy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4990788