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IEC 60904-9:2020 © IEC 2020
𝑆𝑆𝑆𝑆
𝑎𝑎
1
= 0,
𝑆𝑆𝑆𝑆
𝑎𝑎
2
=
𝑚𝑚
2
∙ 𝑄𝑄𝐸𝐸
𝑖𝑖𝑖𝑖𝑟𝑟𝑎𝑎𝑖𝑖
ℎ𝑖𝑖
𝑞𝑞
≅
𝑚𝑚
2
1240
(A.5)
where
the ideal quantum efficiency
𝑄𝑄𝐸𝐸
𝑖𝑖𝑖𝑖𝑟𝑟𝑎𝑎𝑖𝑖
= 1
,
ℎ
is the Planck constant,
𝑖𝑖
is the speed of light, and
𝑞𝑞
is the elementary charge.
SR
will then be given in A/W.
b
1
is the last wavelength at which the spectral responsivity is close to the
one of the ideal cell;
𝑆𝑆𝑆𝑆
𝑏𝑏
1
=
𝑖𝑖
1
∙ 𝑄𝑄𝐸𝐸
𝑖𝑖𝑖𝑖𝑟𝑟𝑎𝑎𝑖𝑖
ℎ𝑖𝑖
𝑞𝑞
≅
𝑖𝑖
1
1240 ,
𝑆𝑆𝑆𝑆
𝑏𝑏
2
= 0
(A.6)
b
2
is the last wavelength at which the spectral responsivity is above zero;
The spread of the reference SR curve is modelled by two parameters:
x
is the dispersion unit of the spectral responsivity (SR-kx) around the data points
a
2
and
b
1
(see Figure A.1).
k
is the multiplier of the dispersion unit of the spectral responsivity around
the data points
a
2
and
b
1
(see Figure A.1).
𝑚𝑚
2−𝑘𝑘𝑘𝑘
=
𝑚𝑚
2
− 𝑘𝑘 ∙ 𝑚𝑚
(A.7)
𝑖𝑖
1+𝑘𝑘𝑘𝑘
=
𝑖𝑖
1
+
𝑘𝑘 ∙ 𝑚𝑚
(A.8)
Only the
two parameters
a
2
and
b
1
are varied, whereas the parameters
a
1
and
b
2
remain
fixed.
Table A.1 provides the parameters of the reference spectral responsivity of Figure A.1 and
proposed dispersion parameters (x, k). Table A.1 can be extended
with additional PV
technologies, if required. Figure A.2 shows the reference spectral responsivity curves for the
considered PV technologies.
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