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Bromination Induced Stability Enhancement with Multivalley Optical Response Signature in Guanidinium [C(NH2)3]+ Based Hybrid Perovskite Solar Cells

Abstract

Guanidinium lead iodide (GAPbI3) has been synthesized experimentally, but stability remains an issue, which can be modulated with insertion of bromine (Br) in the system. We have performed a systematic theoretical investigation to see how the bromination can tune the stability of the GAPbI3. The optical properties are also determined and we have found the formation enthalpy based stability in the perovskite systems that are active in visible and IR region even after the bromine insertion and additionally more active in the IR range with the transition from GAPbI3 to GAPbBr3. The spin orbit coupling effect is considered throughout the band structure calculations. The ensemble of the primary and secondary gaps in the half and full brominated hybrid perovskites lead to the phenomena of multipeak response in the optical spectra, which can be attributed as multivalley optical response behavior subsequently. These multivalley optical behavior enables the brominated Guanidinium based hybrid perovskites to have broad light harvesting abilities and this can be perceived as an idea of natural multi-junction solar cell.

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Publication details

The article was received on 10 Apr 2017, accepted on 02 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA03114A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Bromination Induced Stability Enhancement with Multivalley Optical Response Signature in Guanidinium [C(NH2)3]+ Based Hybrid Perovskite Solar Cells

    A. Banerjee, S. Chakraborty and R. Ahuja, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03114A

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