Rapid thermal annealing of CH3NH3PbI3 perovskite thin films by intense pulsed light with aid of diiodomethane additive

The organic metal halide perovskite material is capable of high throughput manufacturing via traditional deposition processes used in roll-to-roll, yet thermal annealing post deposition may require long ovens. We report rapid annealed perovskite thin films using intense pulsed light (IPL) to initiat...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (20), p.9378-9383
Main Authors: Ankireddy, Krishnamraju, Ghahremani, Amir H, Blake, Martin, Gupta, Gautam, Druffel, Thad
Format: Article
Language:English
Subjects:
Annealing
Annealing furnaces
Cytology
Deposition
Formulations
Halides
Iodides
Iodine
Light effects
Manufacturing
Manufacturing industry
Ovens
Performance enhancement
Photovoltaic cells
Process parameters
Solar cells
Thermal response
Thin films
Ultraviolet radiation
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Summary:The organic metal halide perovskite material is capable of high throughput manufacturing via traditional deposition processes used in roll-to-roll, yet thermal annealing post deposition may require long ovens. We report rapid annealed perovskite thin films using intense pulsed light (IPL) to initiate a radiative thermal response that is enabled by an alkyl halide additive that collectively improves the performance of a device processed in an ambient environment from a baseline of 10 to 16.5% efficiency. Previous reports on CH3NH3PbI3 perovskite films using IPL processing achieved functional devices in milli-second time scales and are promising for high throughput manufacturing processes under ambient conditions. In this study, we found that the addition of diiodomethane (CH2I2) as an additive to the methylammonium iodide (MAI)/lead iodide (PbI2) precursor ink chemistry and subsequent IPL thermal annealing are inter-dependent. The concentration of CH2I2 and IPL processing parameters have a direct effect on the surface morphology of the films and performance within a perovskite solar cell (PSC). The CH2I2 dissociates under exposure to ultraviolet (UV) radiation from the IPL source liberating iodine ions in the film, influencing the perovskite formation and reducing the defect states. We anticipate that these results can be utilized to further develop different ink formulations using alkyl halides for the IPL technique to improve the performance of perovskite solar cells processed in ambient conditions.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta01237g