Zero-dimensional hybrid iodobismuthate derivatives: from structure study to photovoltaic application

The quest for lead-free light-absorbing perovskite materials has long been the target of researchers to make the 'star' material friendly to the commercial market. After a summary of different lead-free solar absorbers, we demonstrate a zero-dimensional iodobismuthate (MA)(3)[BiI6]center dot 3MACl (MA: CH3NH3) featuring isolated hexaiodobismuthate(III) anions in the crystal analysis. The unexpectedly formed material was made via an orthogonal solvent permeation method and the decomposition of the guest solvent. We compare the BiI63- containing compound with a series of more common iodobismuthates, especially the dinuclear Bi2I93- in terms of dimensionalities via single-crystal diffraction and DFT calculations, respectively. An undocumented second-order phase transition was found between 190 K and 160 K for the dimeric MA(3)Bi(2)I(9). The photovoltaic device from a thermally reorganized polycrystalline film of (MA)(3)[BiI6]center dot 3MACl, which resembled the structure of (MA)(3)[Bi2I9] gave a power conversion efficiency of 1.09%.


Published in:
Dalton Transactions, 49, 18, 5815-5822
Year:
May 14 2020
Publisher:
Cambridge, ROYAL SOC CHEMISTRY
ISSN:
1477-9226
1477-9234
Keywords:
Laboratories:
LCR
LQM




 Record created 2020-06-04, last modified 2020-10-25


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