A new
variant of the classic pulsed laser deposition (PLD) process
is introduced as a room-temperature dry process for the growth and
stoichiometry control of hybrid perovskite films through the use of
nonstoichiometric single target ablation and off-axis growth. Mixed
halide hybrid perovskite films nominally represented by CH3NH3PbI3–x
A
x
(A = Cl or F) are also grown and are shown to reveal
interesting trends in the optical properties and photoresponse. Growth of good quality lead-free
CH3NH3SnI3 films is also demonstrated,
and the corresponding optical properties are presented. Finally, perovskite
solar cells fabricated at room temperature (which makes the process
adaptable to flexible substrates) are shown to yield a conversion
efficiency of about 7.7%.
A molecular ion (BF4(-)) substituted hybrid perovskite CH3NH3PbI(3-x)(BF4)x is synthesized. The substituted perovskite shows significant enhancement in electrical conductivity at low frequencies and improved photoresponse under AM1.5 illumination as compared to the perovskite (CH3NH3PbI3).
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