\documentclass[pagesize]{scrartcl}
\usepackage[x-cp1252]{inputenx}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{pst-barcode}
\usepackage[%
	paperwidth=2.02in,paperheight=2.02in,%
	textwidth=2in,textheight=2in,%
% 	margin=.01in%
	]{geometry}

\begin{document}
\noindent
\begin{pspicture}(2in,2in)%
\psbarcode{%
	http://axel.berger-odenthal.de/work/Referat/%
	}{width=2 height=2 %parse%
	}{qrcode}
\end{pspicture}
\end{document}
