Modelling of polycrystalline thin film solar cells: new features in SCAPS version 2.3

Modern characterisation of thin film solar cells is based on a variety of standard and advanced (opto-) electrical experiments. In the case of complicated structures, like most of the polycrystalline thin film solar cells, interpretation of such experiments is almost impossible without the help of simulation programs. In many cases numerical simulation of a thin film solar cell can lead to better insight into the details of physical operation. It can even give new insights to improve the technology. The numerical simulation tool SCAPS [1][2][3] is developed at our lab to deal with polycrystalline thin film solar cells. The program is able to simulate standard experiments like I(V) and QE(lambda) as well as more advanced measurements like C(V) and C(f). The program is now in a state of extension to transient analysis; it will be able to simulate current and capacitance in function of time. Different methods to solve the time dependent problem and first results and observations of transient behaviour are treated in this article.