Effect of KF absorber treatment on the functionality of different transparent conductive oxide layers in CIGSe solar cells

Keller, Jan; Chalvet, Francis; Joel, Jonathan; Aijaz, Asim; Kubart, Tomáš; Riekehr, Lars; Edoff, Marika; Stolt, Lars; Törndahl, Tobias

doi:10.1002/pip.2925

Cited by 25 publications

(19 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Next, we discuss the changes of the distribution of alkali metals in the CsF‐treated CIGS thin film due to HLS treatment, which is in line with the results presented in previous studies . Figure a shows a SIMS depth profile of CsF‐treated CIGS solar cell before and after HLS treatment.…”

supporting

confidence: 83%

Metastable Behavior on Cesium Fluoride‐Treated Cu(In_1–x,Ga_x)Se₂ Solar Cells

Khatri

Yashiro

Lin

et al. 2020

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

Metastable behavior of cesium fluoride (CsF)‐treated Cu(In1–x,Gax)Se2 (CIGS) solar cells is investigated under heat‐light soaking (HLS) and heat‐soaking (HS) treatments. HLS increases open‐circuit voltage, fill factor, efficiency, and net carrier concentration and decreases short‐circuit current density, whereas heat‐soaking treatment acts oppositely. The performance of a CsF postdeposition treatment to CIGS thin film in selenium vapor, and closer to stoichiometry copper content, did not mitigate the open‐circuit voltage improvement after HLS. These results argue the traditional concept of the VSe–VCu divacancy complex for the total beneficial effect of HLS in alkali‐treated CIGS solar cells. The metastable behavior observed in the CsF‐treated devices due to the HLS and HS treatments is explained by the specific behavior of alkali‐containing new compounds at the surface and/or the migration of alkali metals at the surface and bulk regions.

show abstract

supporting

confidence: 83%

Metastable Behavior on Cesium Fluoride‐Treated Cu(In_1–x,Ga_x)Se₂ Solar Cells

Khatri

Yashiro

Lin

et al. 2020

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

show abstract

“…Therefore, this result implies that N CV of NaF‐treated CIGS solar cells could be tuned to an adequate value by the HLS/HS process. One of the possible explanations for the reduced N CV by HS could be that the direct occupation of copper vacancies ( V Cu ) acts as the acceptor‐like defects by Na atoms, which was suggested earlier, when the Na concentration becomes too high . In our experiment, a large number of Na atoms exists at the surface of CIGS layer after the NaF‐PDT.…”

Section: Basic Cell Parameters Of the Naf‐free And Naf‐treated Cigs Smentioning

confidence: 48%

Tunable Carrier Concentration of NaF‐Treated CIGS Solar Cells Using Heat–Light Soaking and Subsequent Heating

Matsuura

Shudo

Khatri

et al. 2018

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

The combined effect of the heat–light soaking (HLS) and subsequent heat‐soaking (HS) processes is investigated on NaF‐free and NaF‐treated CIGS solar cells with CdS buffer layer. The HLS treatment improves cell efficiency slightly with increased open‐circuit voltage for NaF‐treated CIGS solar cells, whereas the cell efficiency deteriorates for NaF‐free CIGS solar cells. The different behaviors between both types of solar cells may be due to a Na‐containing new layer, which is formed at the CIGS surface region by NaF‐treatment. On the other hand, the short‐circuit current density (JSC) decreases for both types of solar cells after HLS treatment, which is attributed to the extremely high carrier concentration (NCV), leading to a narrower space charge region. However, it is found that the large NCV can be tuned to an appropriate value using the subsequent HS technique. As a result, the JSC loss is successfully reduced, therefore improving cell efficiency. The details of this improved efficiency are discussed with respect to the change of NCV in CIGS solar cells by the HLS and HS processes.

show abstract

“…Figure ). This effect could also explain results of a study, which was performed by Keller et al There, the authors investigated the effect of different substrate temperatures during TCO deposition and found that samples with KF‐PDT showed lower FF and V OC after TCO‐deposition at elevated temperatures.…”

Section: Discussionmentioning

confidence: 59%

Elucidating the Mechanism of an RbF Post Deposition Treatment in CIGS Thin Film Solar Cells

et al. 2018

View full text Add to dashboard Cite

The impact of a rubidium fluoride post deposition treatment (RbF-PDT) on the material and device properties of Cu(In,Ga)Se 2 (CIGS) thin films and corresponding solar cells is investigated. The structure and device properties of CIGS with different PDT duration are compared. With longer PDT duration, which equals a higher amount of RbF deposited on the CIGS absorber layer, a clear trade-off is observed between increasing open-circuitvoltage (V OC ) and decreasing fill factor (FF). An optimum of the PDT duration is found increasing the efficiency by about 0.8% (absolute) compared to the Rb-free reference device. The mechanisms behind the increased V OC are explored by various characterization methods and identified as a combination of increased carrier concentration and reduced recombination rates in the device. Possible origins for these mechanisms are discussed. Furthermore numerical simulations are used to analyze the detrimental effect of the PDT on the FF. It is found that thermally activated alkali migration into the transparent front contact could create acceptor states there, which could explain the observed FF-loss.

show abstract

Effect of KF absorber treatment on the functionality of different transparent conductive oxide layers in CIGSe solar cells

Abstract: This contribution studies the impact of the KF-induced Cu(In,Ga)Se 2 (CIGSe) absorber modification

Cited by 25 publications

References 33 publications

Metastable Behavior on Cesium Fluoride‐Treated Cu(In_1–x,Ga_x)Se₂ Solar Cells

Metastable Behavior on Cesium Fluoride‐Treated Cu(In_1–x,Ga_x)Se₂ Solar Cells

Tunable Carrier Concentration of NaF‐Treated CIGS Solar Cells Using Heat–Light Soaking and Subsequent Heating

Elucidating the Mechanism of an RbF Post Deposition Treatment in CIGS Thin Film Solar Cells

Contact Info

Product

Resources

About

Effect of KF absorber treatment on the functionality of different transparent conductive oxide layers in CIGSe solar cells

Abstract: This contribution studies the impact of the KF-induced Cu(In,Ga)Se 2 (CIGSe) absorber modification

Cited by 25 publications

References 33 publications

Metastable Behavior on Cesium Fluoride‐Treated Cu(In1–x,Gax)Se2 Solar Cells

Metastable Behavior on Cesium Fluoride‐Treated Cu(In1–x,Gax)Se2 Solar Cells

Tunable Carrier Concentration of NaF‐Treated CIGS Solar Cells Using Heat–Light Soaking and Subsequent Heating

Elucidating the Mechanism of an RbF Post Deposition Treatment in CIGS Thin Film Solar Cells

Contact Info

Product

Resources

About

Metastable Behavior on Cesium Fluoride‐Treated Cu(In_1–x,Ga_x)Se₂ Solar Cells

Metastable Behavior on Cesium Fluoride‐Treated Cu(In_1–x,Ga_x)Se₂ Solar Cells