BandDiagram.js

This is a tool allowing you to build schematic band diagrams in SVG using Anderson's Rule.

I haven't created the constructor because it is more convenient for me to use this as a library, alternating the source code.

How-to use

Very easy indeed:

	let front = new Material({Fermi : -4.9}, "ITO"); //Creates a layer, the material is Indium Tin Oxide, the origin is vacuum level
	let acc = new Material({HOMO : -5.2, LUMO : -3.2, Fermi : -4.39}, "P3HT"); //an acceptor organic semiconductor: poly(3-hexyl)thiophene
	let don = new Material({HOMO : -6.1, LUMO : -3.7, Fermi : -4.44}, "PCBM"); //a donor organic semiconductor: [6,6]-phenyl C61 butyric acid methyl ester
	let rear = new Material({Fermi : -4.06}, "Al"); //the rear contact: aluminum

	let h = new Hetero([front, acc, don, rear]); //Assemble the heterostructure
	h.align(); //align the Fermi levels of the heterostructure
	//h.align("vacuum");//or you can align vacuum level
	h.draw(null, 500, 500, 50); //returns SVG, the first argument is SVG.js object (if you want to draw on existing svg), then width, height and offset from top;

Helpers and Sugar

You can use AutoKeyedStorage to store and retrieve materials (it is also suitable to store anything else, so feel free to reuse). It's just a Map with 2 useful properties:

• you can access its content using . and []
• you can add elements w/o keys using add, the keys will be derived automatically (by default they are taken from name attribute).

For example, you can write

let materials=new AutoKeyedStorage();
... //fill it with materials
let h=new Hetero("ITO/P3HT/PCBM/Al".split("/").map(ln => materials[ln]).filter((e)=>!!e));

.

All the classes are iterables (you can use them in for ... of loops and convert to arrays with Array.from()) and enumerables (you can use them in for ... in loops and use Object.* methods).

Tweaking

• you can change Fermi level name using Hetero::FermiLevelName
• you can assign custom colors to levels by their name using Hetero::colorMapping
• you can change color mapping to your own by redefining Hetero::getColorFromName, for example you can choose colors from the predefined list or hash level name for example with crc32 and derive color from the hash value.

Examples