English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Hybrid organic-inorganic halide perovskites are promising materials for thin-film solar cells. However, the toxicity and instability of best-in-class lead-halide perovskite materials make them nonideal. To combat these issues, we replaced lead with bismuth and explored the sensitivity of these new lead-free materials to the valency and bonding of their cationic organic groups. Specifically, we synthesized and characterized the materials properties and photophysical properties of hexane-1,6-diammonium bismuth pentaiodide ((HDA(2+))BiI5) and compared them to an analogue containing a more volatile organic group with half the number of carbon and nitrogen atoms in the form of n-propylammonium ((PA(+))(x)BiI3+x, where 1 < x < 3). The full crystallographic structures of (HDA(2+))BiI5 and (PA(+))(x)BiI3+x, were resolved by single-crystal X-ray diffraction. (HDA(2+))BiI5 was shown to be pure-phase and have a one-dimensional structure, whereas (PA(+))(x)BiI3+x was shown to be a mix of one-dimensional and zero-dimensional phases. Structures of the materials were confirmed by synchrotron X-ray diffraction of powders. Both (HDA(2+))BiI5 and (PA(+))(x)BiI3+x exhibit steady-state photoluminescence at room temperature. Density functional theory calculations of (HDA(2+))BiI5 predict electronic absorption features and a similar to 2 eV bandgap that are consistent with those observed experimentally. Structure-property relationships of the materials were examined, and moisture tolerance and film quality were found to be superior for dication-containing (HDA(2+))BiI5 in relation to monocation-containing (PA(+))(x)BiI3+x. We hypothesize that these trends are in part due to a molecular bridging effect enabled by the presence of the dicationic hexanediammonium groups in (HDA(2+))BiI5. Solar cells fabricated using (HDA(2+))BiI5 as the photoactive layer exhibited photovoltaic action while those containing (PA(+))(x)BiI3+x did not, suggesting that organic dicationic groups are beneficial to light-absorber morphology and ultimately solar-cell performance.

acs applied energy materials

Influence of One Specific Carbon–Carbon Bond on the Quality, Stability, and Photovoltaic Performance of Hybrid Organic–Inorganic Bismuth Iodide Materials