We investigate the luminescent coupling (LC) effects in a four-junction GaInP/GaAs//GaInAsP/GaInAs concentrator solar cell based on transient open-circuit voltage (Voc) measurements under monochromatic illumination. Photocurrent generation in the non-absorbing GaInAs bottom subcell due to LC from upper subcells shows superlinear behavior with increasing light intensity. Along with this, a Voc enhancement is observed and quantified for illumination intensities that span almost six orders of magnitude. The Voc increase is explained and studied using a series-connected diode model including subcell shunt resistances, capacitances, and LC effects. The impact of unilluminated subcells on the subcell Voc determination is discussed for multi-junction solar cells. Finally, in the analysis of the LC generated photocurrent, namely, the coupling factor from the GaInAsP to the non-absorbing GaInAs subcell, a characteristic dependency on bias voltage is shown and explained by a result of competing photo- and electroluminescence mechanisms.
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14 November 2018
Research Article|
November 13 2018
Transient analysis of luminescent coupling effects in multi-junction solar cells
Takeshi Tayagaki;
Takeshi Tayagaki
a)
1
Fraunhofer Institute for Solar Energy Systems (ISE)
, Heidenhofstr. 2, 79110 Freiburg, Germany
2
Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba, Ibaraki 305-8568, Japan
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S. Kasimir Reichmuth
;
S. Kasimir Reichmuth
1
Fraunhofer Institute for Solar Energy Systems (ISE)
, Heidenhofstr. 2, 79110 Freiburg, Germany
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Henning Helmers
;
Henning Helmers
1
Fraunhofer Institute for Solar Energy Systems (ISE)
, Heidenhofstr. 2, 79110 Freiburg, Germany
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Gerald Siefer
Gerald Siefer
1
Fraunhofer Institute for Solar Energy Systems (ISE)
, Heidenhofstr. 2, 79110 Freiburg, Germany
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J. Appl. Phys. 124, 183103 (2018)
Article history
Received:
June 28 2018
Accepted:
October 27 2018
Citation
Takeshi Tayagaki, S. Kasimir Reichmuth, Henning Helmers, Gerald Siefer; Transient analysis of luminescent coupling effects in multi-junction solar cells. J. Appl. Phys. 14 November 2018; 124 (18): 183103. https://doi.org/10.1063/1.5046543
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