Volume : 2, Issue : 2, JAN 2018

CARRIER MOBILITY AND ANOMALOUS PCE HYSTERESIS IN METHYL AMMONIUM LEAD PHOTO CELLS

Mosiori, Cliff Orori

Abstract

Hybrid perovskite solar cells have been developing at a staggering pace in just a few years with the first perovskite cell reported in 2009 managing about 4% PCE. By 2015, perovskite cells had been certified as having more than 20-percent efficiency. However, a number of questions on methyl ammonium lead trihalide (CH3NH3PbI3) absorbers remain unanswered. This includes its varying PCE values obtained through rapid reverse and forward scans that yield anomalous hysterical efficiencies. Already, NREL certified PCE values of CH3NH3PbI3 solar cell is classified as “unreliable” and not be justifiable for patenting. Solar efficiency basically relies on the behavior of I-V characteristic curve. Such revelations require consistent experimental investigations to explain how electron or charge mobility traverses through CH3NH3PbI3 thin films through consistent reproducible experimental techniques like the solvent-solvent extraction method. Photoluminescence measurements; Atomic Force Microscopy, cross-sectional scanning transmission electron microscopy and Time-of-Flight spectrometry are important paramount investigations that can reveal amazing intrinsic relations to electron mobility and transport mechanisms especially those carried with temperature dependent longitudinal and Hall resistances measurements using the standard four-terminal method.

Keywords

Photoluminescence; Time-of-Flight spectrometry, perovskite solar cell, PCE efficiencies.

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References

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