Please explain me about the different layers of Quantum Dot Solar cells. And thickness of each layer (nanometers).
the most basic geometry is a layer of QD with a schottky contact. in this case the metal elecytrodes is typically 50-100nm thick. The QD layer is 100-300nm thick. this is below the absorption depth of the QD layer but this value is a trade off. Thicker layer absorbs more but tranport properties get worst. Indeed the diffusion length is more 50-100nm, thicker layer are consequently not electrically active. In addition crack tends to form on thick film which lead to short
A more sophicticated way to build the PV cell is to encapsulate the QD layer between an electron and a hole transport layer. Electron transport layer is genrally an oxide (ZnO or TiO2). the hole transport layer is generally a p type conductive polymer with a thickness of 100nm (just given as an order of magnitude)
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