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Transmittance level of stray light determined for: (A) a conventional spectroradiometer; and (B) the spectroradiometer equipped in this device.
Source publication
A new irradiance adjustment system for the light source named “Programmable Reference cell system for Irradiance adjustment by Spectral Measurement (PRISM)” has been developed for photovoltaics evaluation. It can be applied for various kinds of solar cells and illumination conditions without the preparation of conventional reference cells. This sys...
Contexts in source publication
Context 1
... it has a unique optical system to reduce stray light which causes inaccurate readings. Figure 2 shows the transmittance level of the stray light measured in accordance with JIS Z8724 (Japan Industrial Standards, Methods of measure- ment Light-source colour) [23]. ...
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... solar cell efficiency (g) under LED was more than twice that obtained under 1 sun. Figure 12 shows the relationship between the spectral responsivity of the OPV and spectral irradiances of the light sources. As shown in Figure 12, the light emission wavelength region of the LED was approximately within the absorption wavelength region of the OPV, however, the wavelength region of natural sunlight is much wider than the absorption wavelength region of the OPV. ...
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... 12 shows the relationship between the spectral responsivity of the OPV and spectral irradiances of the light sources. As shown in Figure 12, the light emission wavelength region of the LED was approximately within the absorption wavelength region of the OPV, however, the wavelength region of natural sunlight is much wider than the absorption wavelength region of the OPV. This may explain why the g obtained under LED was greater than that obtained under 1 sun. ...
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... newly developed PRISM system, consisting of a SK- 1150 unit which measures the absolute spectral responsiv- OPV, organic thin film solar cell. Figure 12. Relationship between the spectral responsivity of the OPV (S(k)) and spectral irradiance of the light sources ((E_LED(k) for LED, E_ss(k) for the San-ei Electric XES-40S (1 sun)). ...
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Citations
... The incident photon to current conversion efficiencies of co-sensitized dye systems were also estimated since it is critical and useful to explore the steady-state performance of photoanode [18][19][20][21][22]. By using a Newport solar simulator, photovoltaic properties were also measured under AM 1.5 G illumination (full sun) [23]. ...
... Slightly higher LHE values are found as LEG4 and DB co-sensitization. Further important steady-state characteristics for selecting highly efficient co-sensitization system or light-absorbing materials, optical transition energies E 0-0 (s), are determined from absorption spectra using the formula E = 1240∕ (max) upon variation of molar ratio of LEG4 and DB in co-sensitized dye system as presented in these reports [7,18]. It is important to read the wavelength onset values carefully. ...
The mixture of two organic dyes, D35-cpdt and DN-F10, namely, LEG4 and DB, were used as the efficient co-sensitizers with cobalt(II/III) redox mediator in dye-sensitized solar cells (DSSCs). The co-sensitized system is optimized via the variation of DB amount while maintaining a constant amount of LEG4 dye. We achieve an improved photovoltaic performance as the utilization of the co-sensitized dye systems in DSSC devices. The individual dye LEG4 and DB can produce the efficiency of 3.10% and 3.50%, respectively, while the efficiency up to 5.60% can be achieved in co-sensitized dye system (LEG:DB). The photocurrent (JSC = 8.40 mA cm⁻²), open-circuit voltage (VOC = 0.73 V), and fill factor (FF = 0.50) are also enhanced under AM 1.5 G illumination with the 100 mW·cm⁻² intensity. High steady state in the dye mixture can be attributed to the increased photocurrent and power conversion efficiency. The co-sensitization system of two dyes can reduce the recombination loss. The study shows that the co-sensitizing dye system has complementary characteristics and provides a broader optical absorption, which can harvest photons in a wider spectral region to increase photocurrent density in the devices with the co-sensitized dye system as well as better charge transport. This current work will be significant for the performance enhancement of photovoltaic conversion via the mixture of dyes.
Graphical abstract
The two organic dyes LEG4 (red) and DB (blue) have complementary spectra and are used as the co-sensitized dye in dye-sensitized solar cells. The performance of photoelectricity conversion can be significantly improved.
