Investigation of the open-circuit voltage in wide-bandgap InGaP-host InP quantum dot intermediate-band solar cells

Aihara, Taketo; Tayagaki, Takeshi; Nagato, Yuki; Okano, Yoshinobu; Sugaya, Takeyoshi

doi:10.7567/jjap.57.04fs04

Cited by 5 publications

(4 citation statements)

References 32 publications

(61 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is necessary to suppress the voltage reduction in the QD solar cells. 14,21,35) The suppressed thermal escape should be confirmed in future two-step photon absorption experiments. Finally, to check the impact of the host absorber thickness on the QD solar cells, we investigated the photocarrier generation at QDs in the InP=InGaP QD solar cells using PL measurements.…”

Section: Resultsmentioning

confidence: 83%

See 1 more Smart Citation

Design and characterization of InGaP-based InP quantum dot solar cells

Aihara

Tayagaki

Nagato

et al. 2018

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

In an ideal intermediate-band (IB) concept, the host semiconductor generates current by absorbing short-wavelength light and the IB is used to absorb long-wavelength light. Here, we investigate the impact of the host absorber thickness at the front side of the cells on the properties of InGaP-based InP quantum dot (QD) solar cells. We prepared the InGaP-based InP QD cells with the front i-InGaP layer and compared them with the cells without the front i-InGaP layer. The insertion of the front i-InGaP layer results in an increase in quantum efficiency in the visible region, indicating that the short-wavelength light absorbed at the InGaP host increases the short-circuit current density in the cell. In addition, a thick host layer leads to reduced quantum efficiency below the host bandgap energy, which indicates that the thermal escape from QDs is suppressed. These results indicate that the optimization of the host semiconductor thickness is critical for achieving the ideal operation of the IB concept in the QD solar cells.

show abstract

Section: Resultsmentioning

confidence: 83%

“…1,5,7) The effect of suppressed thermal carrier extraction on the V oc is also under study. 35) Figure 4(a) shows the EQE under varying applied bias voltages of the InP QD solar cells with a thick front i-InGaP layer. The results reveal that the EQE increases with decreasing bias voltage, which is equivalent to increasing reverse-bias voltage.…”

Section: Resultsmentioning

confidence: 99%

Design and characterization of InGaP-based InP quantum dot solar cells

Aihara

Tayagaki

Nagato

et al. 2018

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Many such technologies employ multi-bandgap and other quantum engineering approaches to circumvent the shortcomings of the single-junction devices that were considered in calculating this limit [5,[35][36][37][38][39][40][41][42][43][44][45]. Alternative approaches include hot carrier devices, which increase the photovoltage by harvesting charge carriers before they can thermalise [46,47], and the use of concentrator modules to increase the amount of light collected by a solar converter, which can lead to the required efficiencies but comes at increased cost and complexity, and it causes the devices to operate at high temperatures [48][49][50].…”

Section: Discussionmentioning

confidence: 99%

A Quantitative Analysis of the Need for High Conversion Efficiency PV Technologies in Carbon Mitigation Strategies

Hughes,

Phillips

2024

Solar

View full text Add to dashboard Cite

We consider the restrictions on photovoltaic (PV) capacity that are caused by limitations on where panels can be sited and find quantitative evidence for the need for high efficiencies. We define 15% of the UK’s energy consumption as a “significant” contribution and, with London as an exemplar, we perform an idealised calculation that makes the most optimistic possible assumptions about the capabilities of future PV technologies and use published surveys on energy usage, dwelling type and insolation. We find that covering every UK domestic roof with the highest power conversion efficiency (PCE) solar panels currently commercially available could produce up to 9% of the UK’s energy. A 15% contribution would require PV technologies with >37% PCE, more than the theoretical Shockley–Queisser limit. Replacing the idealising assumptions with more realistic estimates increases this by 2–3 times. Alternatively, a solar farm using the currently available PCEs would require a politically challenging ~1200 km2 of new land, roughly the area of Greater London, for this 15% contribution. We conclude that PCEs must be driven higher than even the Shockley–Queisser limit for PV to play a significant part in carbon mitigation.

show abstract

“…These are currently at the research stage, and typically employ e.g. multi-bandgap and other quantum engineering approaches to circumvent the shortcomings of the single junction devices that were considered in calculating this limit [5,[35][36][37][38][39][40][41][42][43][44][45].…”

Section: Discussionmentioning

confidence: 99%

A Quantitative Analysis of the Need for High Conversion Efficiency PV Technologies in Carbon Mitigation Strategy

Hughes,

Phillips

2024

Preprint

View full text Add to dashboard Cite

We consider the restrictions on photovoltaic (PV) capacity that are caused by limitations on where panels can be sited, and find quantitative evidence for the need for high efficiencies. We define 15% of the UK’s energy consumption as a “significant” contribution and, with London as an exemplar, we perform an idealised calculation that makes the most optimistic possible assumptions about the capabilities of future PV technologies, and use published surveys of energy usage, dwelling type and insolation. We find that covering every UK domestic roof with the highest power-conversion efficiency (PCE) solar panels currently commercially available, could produce up to 9% of the UK's energy. A 15% contribution would require PV technologies with &gt;37% PCE, more than the theoretical Shockley-Queisser limit. Replacing the idealising assumptions with more realistic estimates increases this by 2-3 times. Alternatively, a solar farm using the currently available PCEs would require a politically challenging ~1200km2 of new land, roughly the area of Greater London, for this 15% contribution. We conclude that PCEs must be driven higher even than the Shockley-Queisser limit for PV to play a significant part in carbon mitigation.

show abstract

Investigation of the open-circuit voltage in wide-bandgap InGaP-host InP quantum dot intermediate-band solar cells

Cited by 5 publications

References 32 publications

Design and characterization of InGaP-based InP quantum dot solar cells

Design and characterization of InGaP-based InP quantum dot solar cells

A Quantitative Analysis of the Need for High Conversion Efficiency PV Technologies in Carbon Mitigation Strategies

A Quantitative Analysis of the Need for High Conversion Efficiency PV Technologies in Carbon Mitigation Strategy

Contact Info

Product

Resources

About