Lead-free halide perovskite semiconductors are necessary due to the atmospheric instability and lead toxicity associated with the 3D lead halide perovskites. However, a stable lead-free perovskite with an ideal bandgap (1.2-1.4 eV) for photovoltaics is still missing. In this work, we synthesized organic-inorganic gold halide double perovskites ((CH3NH3)2Au2X6, X = Br, I) through a solution-processed route that offers an ideal direct bandgap for photovoltaic applications. Density functional theory calculations confirm the direct nature of bandgap nature with reasonable absorption coefficients in the visible range and excellent charge transport properties. In addition, the Au-halide perovskites show high chemical stability and photoresponse. These combined properties demonstrate that Au-based halide perovskites can be a promising group of compounds for optoelectronic applications.

Direct-bandgap Mixed-valence Organic-inorganic Gold Perovskite as Visible Light Absorber

Silver bismuth iodide has been studied comprehensively for its potential as light harvesters, owing to their low toxicity and environment conviviality. However, they often suffer with low efficiencies as compared to conventional light harvesters and hence there is a broad room for improvement. Here we propose doping the standard AgBiI4 composition with tin (Sn), to improve the relative absorbance and thereby potentially improving the efficiencies. It is observed that the addition of Sn did not alter the structural properties significantly, while it works on the orientation of the crystal growth during thin film synthesis, leading to ordered and uniform films. An improvement in absorption coefficient was observed, which can be considered to improve the performances of devices fabricated with AgBiI4 as light harvesters.

Tin Doped Silver Bismuth Iodide as Superior Energy Harvesters

**Session Chair: **Biplab Ghosh

SYM E - Lead-free halide perovskite

technical paper

**Please view our Welcome to MH21 video.**

<center>
<figure class="video_container">
	 <iframe src="https://screencast-o-matic.com/watch/cr1UYHV1pcz?v=6&ff=1&title=0&controls=1" width=826 height=526 frameborder="0" allowfullscreen="true"> </iframe>
</figure>
	</center>


**Walkthrough Video**

Here is a Walkthrough showing how to navigate the conference and network with others 

<center>
<figure class="video_container">
	 <iframe src="https://screencast-o-matic.com/watch/cr1vnrV1paE?v=6&ff=1&title=0&controls=1" width=826 height=526 frameborder="0" allowfullscreen="true"> </iframe>
</figure>
	</center>




	 Organized by
 
<a href="https://mrs.org.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/95d5789689d5f900b90e9fe54ea3cf0d.jpg"</a>

 
	
	 In association with
 
<a href="http://www.ntu.edu.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/334cd171ad2fdee033c635b368e5e160.png"</a>
	<a href="https://www.nus.edu.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/32e6f82c0440f7bb24c590f9f67821bd.png"</a>
		<a href="https://www.a-star.edu.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/72557865b589cfa3d2a0243ffce4a270.png"</a>
	
 


	 Supported by
 
		 <a href="https://www.visitsingapore.com/mice/en/about-us/about-secb/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/6e679842ead62be522ba6a630b82d5c9.png"</a>

To access the MH 21 Conference, [please register](https://mh21.mrs.org.sg/event/da3f9651-429f-4763-81b2-ebd7311b6bc8/websitePage:206f7605-1731-41f9-8421-56d3890f398f)

MATERIALS FOR HUMANITY (MH 21)

MH 21 is arranged around 6 themes that focus attention on pressing needs that should be addressed to enhance the well-being of communities and provide a forum for presenting breakthrough discoveries.

**Session Chair: **Nripan Mathews

Biplab Ghosh

2

SHORT BIO

Presentations

Direct-bandgap Mixed-valence Organic-inorganic Gold Perovskite as Visible Light Absorber

Tin Doped Silver Bismuth Iodide as Superior Energy Harvesters

Stay up to date with the latest Underline news!

PRESENTATIONS

CONFERENCES

COMPANY

RESOURCES