TY - JOUR
T1 - Response to simulated typical daily outdoor irradiation conditions of thin-film silicon-based triple-band-gap, triple-junction solar cells
AU - Krishnan, P.
AU - Schuttauf, J.A.
AU - van der Werf, C.H.M.
AU - Houshyani Hassanzadeh, B.
AU - van Sark, W.G.J.H.M.
AU - Schropp, R.E.I.
N1 - 17th International Photovoltaic Science and Engineering Conference
PY - 2009
Y1 - 2009
N2 - We studied the response to various realistic outdoor conditions of thin-film silicon-based triple-band-gap, triple-junction cells that were made in house. The triple-junction cells consist of a stack of proto-Si:H/proto-SiGe:H/nanocrystalline (nc)-Si:H cells in an n–i–p configuration, fabricated using hot-wire chemical vapour deposition (CVD). Current matching was determined for modeled spectra of four different days of the year that are typical for the northwestern European climate. Spectral modeling was based on measured irradiation data. The results showed that on a clear day in June, when the actual spectrum was closest to the reference AM1.5 spectrum, the matching was ideal. As the spectral shape varied during the course of the day with respect to the AM1.5 reference the matching became progressively worse. We found that the top cell (1.8 eV) and bottom cell (1.1 eV) are most sensitive to spectral changes, whereas the middle cell (1.5 eV) is less sensitive. Overall, it was evident that either cloudiness or seasonal variations led to an increase in current mismatch between the cells. If the sub-cells are closely matched, it may even occur that a cell designed to be current limiting no longer fulfills that role.
AB - We studied the response to various realistic outdoor conditions of thin-film silicon-based triple-band-gap, triple-junction cells that were made in house. The triple-junction cells consist of a stack of proto-Si:H/proto-SiGe:H/nanocrystalline (nc)-Si:H cells in an n–i–p configuration, fabricated using hot-wire chemical vapour deposition (CVD). Current matching was determined for modeled spectra of four different days of the year that are typical for the northwestern European climate. Spectral modeling was based on measured irradiation data. The results showed that on a clear day in June, when the actual spectrum was closest to the reference AM1.5 spectrum, the matching was ideal. As the spectral shape varied during the course of the day with respect to the AM1.5 reference the matching became progressively worse. We found that the top cell (1.8 eV) and bottom cell (1.1 eV) are most sensitive to spectral changes, whereas the middle cell (1.5 eV) is less sensitive. Overall, it was evident that either cloudiness or seasonal variations led to an increase in current mismatch between the cells. If the sub-cells are closely matched, it may even occur that a cell designed to be current limiting no longer fulfills that role.
U2 - 10.1016/j.solmat.2008.09.031
DO - 10.1016/j.solmat.2008.09.031
M3 - Article
SN - 0927-0248
VL - 93
SP - 691
EP - 697
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
IS - 6-7
ER -