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Identifying the Cause of Voltage and Fill Factor Losses in Perovskite Solar Cells by Using Luminescence Measurements
Author(s) -
Wu Nandi,
Wu Yiliang,
Walter Daniel,
Shen Heping,
Duong The,
Grant Dale,
Barugkin Chog,
Fu Xiao,
Peng Jun,
White Thomas,
Catchpole Kylie,
Weber Klaus
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700374
Subject(s) - luminescence , solar cell , voltage , materials science , open circuit voltage , optoelectronics , equivalent series resistance , nanotechnology , electrical engineering , engineering
The open‐circuit voltage ( V OC ) and fill factor are key performance parameters of solar cells, and understanding the underlying mechanisms that limit these parameters in real devices is critical to their optimization. Device modeling is combined with luminescence and cell current–voltage ( I – V ) measurements to show that carrier transport limitations within the cell can significantly reduce the cell voltage around the maximum power point as well as, under certain conditions, at V OC . An important consequence is that the cell terminal voltage cannot be assumed a priori to be only limited by parasitic recombination. It is demonstrated that luminescence‐based measurements can be used to reconstruct cell I – V curves with removal of any transport limitation effects, which allows the contribution of recombination, shunt resistance, and series resistance on the fill factor to be clarified. Such luminescence‐based measurements allow the contactless characterization of cells and cell precursor structures, and should prove highly valuable as a diagnostic tool for the development of new cell structures and large‐area cells.