7 Crystalline Silicon Solar Cells: Heterojunction Cells
193
TC V oc is examined in detail in Chap. 3. Table 7.1 shows values of the temperature
coefficients (TC) and bifacial factors obtained for various c-Si cell types:
An interesting aspect for the operation of solar modules under natural weather
conditions is their performance at different temperatures. For Al-BSF c-Si solar
cells, the temperature coefficient of the MPP point is ~−0.40/°C, which means that
the module’s output decreases sharply with increasing module temperature. The
reference temperature is 25 °C according to STC (Standard Test Conditions). In
contrast, the temperature coefficients of heterojunction solar cells are ~−0.3%/°C and
the power decreases less with higher module temperatures. Haschke et al. [18] shows
that solar modules with high V oc and lower J sc perform better in hot environments
than modules with the same power but lower V oc and higher J sc . The explanation lies
in the fact that in Al-BSF cells the temperature coefficient of the fill factor is high,
so that the high current cannot be dissipated and high losses result. In this respect,
modules equipped with cells having passivated contacts and high V oc are the most
advantageous choice in hot areas.
7.6 Levelized Cost of Electricity (LCOE) of HJT Cells
For all the reasons mentioned above, such as simplicity of the manufacturing process,
low process temperatures, favourable temperature coefficients, bifacial cell architecture, use of thin wafers, advantageous properties with respect to LID, LETID and PID
degradation, excellent passivation, the LCOE
36 values of HJT cells are very interesting compared to those of other cell architectures [19]. Detailed indications about
the Levelized Cost of Electricity (LCOE) can be found in Chap. 13, Sect. 13.1.2.
References
1. R,V.K. Chavali, S. De Wolf, M.A. Alam MA, Device physics underlying silicon heterojunction
and passivating-contact solar cells: A topical review. Prog. Photovolt. Res. Appl. 1–20. https://
doi.org/10.1002/pip.2959
2. W.G.J.H.M. van Sark, L. Korte, F. Roca (eds.), Physics and Technology of AmophousCrystalline Heterostructure Silicon Solar Cells (Springer, Berlin, Heidelberg, 2012)
3. S.W. Glunz, E. Schneiderlöchner, D. Kray, A. Grohe, M. Hermle, H. Kampwerth, R. Preu,
G. Wille, Laser-fired contact silicon solar cells on p- and n-substrates, in Conference 19th
European Photovoltaic Solar Energy Conference (2004)
4. M. Taguchi, M. Tanak, T. Matsuyama, T. Matsuoka, S. Tsuda, S. Nakano, Y. Kishi, Y. Kuwano,
Improvement of the conversion efficiency of polycrystalline silicon thin film solar cells, in 5th
International Photovoltaic Science and Engineering Conference (Kyoto, Japan, 1990), p. 689
5. M. Tanaka, M. Taguchi, T. Matsuyama, T. Swada, S. Tsuda, S. Nakano, H. Hanafusa, Y.
Kuwano, Development of New a-Si/c–Si heterojunction solar cells: ACJ-HIT (Artificially
36 A common method is to calculate the energy price using the Levelized Cost of Electricity (LCOE).
This allows different technologies to be compared on the basis of a standardized calculation basis,
both within the PV and with other energy production sources.
193
TC V oc is examined in detail in Chap. 3. Table 7.1 shows values of the temperature
coefficients (TC) and bifacial factors obtained for various c-Si cell types:
An interesting aspect for the operation of solar modules under natural weather
conditions is their performance at different temperatures. For Al-BSF c-Si solar
cells, the temperature coefficient of the MPP point is ~−0.40/°C, which means that
the module’s output decreases sharply with increasing module temperature. The
reference temperature is 25 °C according to STC (Standard Test Conditions). In
contrast, the temperature coefficients of heterojunction solar cells are ~−0.3%/°C and
the power decreases less with higher module temperatures. Haschke et al. [18] shows
that solar modules with high V oc and lower J sc perform better in hot environments
than modules with the same power but lower V oc and higher J sc . The explanation lies
in the fact that in Al-BSF cells the temperature coefficient of the fill factor is high,
so that the high current cannot be dissipated and high losses result. In this respect,
modules equipped with cells having passivated contacts and high V oc are the most
advantageous choice in hot areas.
7.6 Levelized Cost of Electricity (LCOE) of HJT Cells
For all the reasons mentioned above, such as simplicity of the manufacturing process,
low process temperatures, favourable temperature coefficients, bifacial cell architecture, use of thin wafers, advantageous properties with respect to LID, LETID and PID
degradation, excellent passivation, the LCOE
36 values of HJT cells are very interesting compared to those of other cell architectures [19]. Detailed indications about
the Levelized Cost of Electricity (LCOE) can be found in Chap. 13, Sect. 13.1.2.
References
1. R,V.K. Chavali, S. De Wolf, M.A. Alam MA, Device physics underlying silicon heterojunction
and passivating-contact solar cells: A topical review. Prog. Photovolt. Res. Appl. 1–20. https://
doi.org/10.1002/pip.2959
2. W.G.J.H.M. van Sark, L. Korte, F. Roca (eds.), Physics and Technology of AmophousCrystalline Heterostructure Silicon Solar Cells (Springer, Berlin, Heidelberg, 2012)
3. S.W. Glunz, E. Schneiderlöchner, D. Kray, A. Grohe, M. Hermle, H. Kampwerth, R. Preu,
G. Wille, Laser-fired contact silicon solar cells on p- and n-substrates, in Conference 19th
European Photovoltaic Solar Energy Conference (2004)
4. M. Taguchi, M. Tanak, T. Matsuyama, T. Matsuoka, S. Tsuda, S. Nakano, Y. Kishi, Y. Kuwano,
Improvement of the conversion efficiency of polycrystalline silicon thin film solar cells, in 5th
International Photovoltaic Science and Engineering Conference (Kyoto, Japan, 1990), p. 689
5. M. Tanaka, M. Taguchi, T. Matsuyama, T. Swada, S. Tsuda, S. Nakano, H. Hanafusa, Y.
Kuwano, Development of New a-Si/c–Si heterojunction solar cells: ACJ-HIT (Artificially
36 A common method is to calculate the energy price using the Levelized Cost of Electricity (LCOE).
This allows different technologies to be compared on the basis of a standardized calculation basis,
both within the PV and with other energy production sources.