6533b7d0fe1ef96bd125a4ad

RESEARCH PRODUCT

Efficient Vacuum Deposited P-I-N Perovskite Solar Cells by Front Contact Optimization.

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description

Hole transport layers HTLs are of fundamental importance in perovskite solar cells PSCs , as they must ensure an efficient and selective hole extraction, and ohmic charge transfer to the corresponding electrodes. In p i n solar cells, the ITO HTL is usually not ohmic, and an additional interlayer such as MoO3 is usually placed in between the two materials by vacuum sublimation. In this work, we evaluated the properties of the MoO3 TaTm TaTm is the HTL N4,N4,N4 amp; 8243;,N4 amp; 8243; tetra [1,1 amp; 8242; biphenyl] 4 yl [1,1 amp; 8242; 4 amp; 8242;,1 amp; 8243; terphenyl] 4,4 amp; 8243; diamine hole extraction interface by selectively annealing either MoO3 prior to the deposition of TaTm or the bilayer MoO3 TaTm without pre treatment on the MoO3 , at temperature ranging from 60 to 200 C. We then used these p contacts for the fabrication of a large batch of fully vacuum deposited PSCs, using methylammonium lead iodide as the active layer. We show that annealing the MoO3 TaTm bilayers at high temperature is crucial to obtain high rectification with low non radiative recombination, due to an increase of the electrode work function and the formation of an ohmic interface with TaTm