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Electro‐Optics of Colloidal Quantum Dot Solids for Thin‐Film Solar Cells
Author(s) -
Zhang Xiaoliang,
Hägglund Carl,
Johansson Erik M. J.
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201503338
Subject(s) - quantum dot , materials science , photocurrent , quantum dot solar cell , optoelectronics , solar cell , photovoltaic system , multiple exciton generation , exciton , heterojunction , quantum optics , thin film , plasmonic solar cell , energy conversion efficiency , solar cell efficiency , polymer solar cell , optics , nanotechnology , condensed matter physics , physics , ecology , biology
The electro‐optics of thin‐film stacks within photovoltaic devices plays a critical role for the exciton and charge generation and therefore the photovoltaic performance. The complex refractive indexes of each layer in heterojunction colloidal quantum dot (CQD) solar cells are measured and the optical electric field is simulated using the transfer matrix formalism. The exciton generation rate and the photocurrent density as a function of the quantum dot solid thickness are calculated and the results from the simulations are found to agree well with the experimentally determined results. It can therefore be concluded that a quantum dot solid may be modeled with this approach, which is of general interest for this type of materials. Optimization of the CQD solar cell is performed by using the optical simulations and a maximum solar energy conversion efficiency of 6.5% is reached for a CQD solid thickness of 300 nm.