Publication date: 1st July 2014
Perovskite solar cells have attracted much attention in the last couple of years as they present a cheap and efficient alternative to usual commercial solar cells.
We present herein the use of photo-induced time-resolved techniques to study charge recombination kinetics in complete CH3NH3PbClxI3-x (MAPbICl) solar cells. The work includes the use of: Charge Extraction (CE), Transient Photo-Voltage (TPV), Transient Photo-Current (TPC) and Laser Transient Absorption Spectroscopy (L-TAS). The MAPbICl devices were fabricated with the following architecture FTO/d-TiO2/mp-TiO2/CH3NH3PbClxI3-x/HTM/Au, where low-bandgap polymers semiconductor polymers have been used as hole transport materials (HTM). The influence of chemical additives such as Lithium Bis(Trifluoromethanesulfonyl) Imide (LiTFSI) and tert-Butyl Pyridine (tBuPyr), materials processing and illumination conditions are correlated with the device efficiency.
In overall, the key losses for the device efficiency are identified and discussed to understand the charge transfer reactions in order to improve the solar cell efficiency with the aim to reach the maximum theoretical solar to energy conversion efficiency.
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