Ordering kesterite improves solar cells: A low temperature post-deposition annealing study

Rey, Germain; Weiss, Thomas Paul; Sendler, Jan; Finger, Ashley; Spindler, Conrad; Werner, Florian; Melchiorre, Michele; Hála, Matěj; Guennou, Maël; Siebentritt, Susanne

doi:10.1016/j.solmat.2016.02.014

Cited by 62 publications

(64 citation statements)

References 46 publications

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“…An accurate evaluation of the CZTSSe ordering effect on device parameters by Krammer and Rey shows a significant efficiency increase for ordered CZTSSe, even if the V oc deficit is found not to be affected by the ordering degree of the absorber . A similar conclusion on the V oc deficit is reported in the work by Bourdais et al, in which however no efficiency change is observed …”

Section: Introductionsupporting

confidence: 70%

Cation Disorder In Cu₂ZnSnS₄Thin Films: Effect On Solar Cell Performances

2017

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High (300 °C) and low (160 °C) temperature post deposition annealing treatments are performed on Cu2ZnSnS4 (CZTS) thin film solar cells to modify the order degree of the CZTS absorber and investigate its effect on the device performances. Large and reversible changes of solar cell parameters are observed, with photovoltaic conversion efficiencies varying from about 4% in the case of more ordered materials, up to nearly 8% after the disordering treatment. Both spectrophotometry and photoluminescence reveal that the ordered materials are characterized by a higher bandgap and a lower deep defect density, whereas the absorption tails and the red shift of the luminescence peak compared to the bandgap are found to be independent of the ordering level. Coherently with the bandgap variation, solar cells in the ordered state are characterized by a lower short circuit current density and a higher open circuit voltage. Ordered devices are found to be limited by low fill factor values, often associated with anomalous “S‐shaped” light J–V curves revealing a blocking behavior. A mechanism based on the increase of a blocking barrier at the CZTS/MoS2 back interface induced by a change in the valence band offset is proposed to explain the lower performances of the ordered devices.

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Section: Introductionsupporting

confidence: 70%

Cation Disorder In Cu₂ZnSnS₄Thin Films: Effect On Solar Cell Performances

2017

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“…PL spectra can also be used to determine the band gap of a semiconductor if the material has no tailing and the emission is dominated by band to band transition. However, it is not the case for CZTSe and the main PL peak is usually observed around 100 to 150 meV below the band gap energy due to tailing and the contribution of defects [31,32].…”

Section: Photoluminescence Resultsmentioning

confidence: 98%

Optical properties of Cu_2ZnSnSe_4 thin films and identification of secondary phases by spectroscopic ellipsometry

Demircioğlu¹,

Salas²,

Rey³

et al. 2017

Opt. Express

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Abstract:We apply spectroscopic ellipsometry (SE) to identify secondary phases in Cu 2 ZnSnSe 4 (CZTSe) absorbers and to investigate the optical properties of CZTSe. A detailed optical model is used to extract the optical parameters, such as refractive index and extinction coefficient in order to extrapolate the band gap values of CZTSe samples, and to obtain information about the presence of secondary phases at the front and back sides of the samples. We show that SE can be used as a non-destructive method for detection of the secondary phases ZnSe and MoSe 2 and to extrapolate the band gap values of CZTSe phase.

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“…By comparison with chalcopyrite material, they attribute most of the losses to insufficient carrier lifetime while Gokmen & al. 77 draw an opposite conclusion and incriminate the low mobility. Other studies 41 quantify losses due to low carrier lifetime ("30-50 mV in VOC and 2-4% absolute in efficiciency").…”

Section: Severity Quantification In Literaturementioning

confidence: 96%

“…Second, table 3 shows that contradictory assessment for a single failure mode can be found in literature. For instance, opposite conclusions are drawn to evaluate severity for short minority carrier lifetime and low mobility in Reference 77 and Reference 38,41,50 . This contradiction can either be linked to different analyses of experimental results or more fundamentally can originate from differences in samples behavior that have been prepared by various techniques.…”

mentioning

confidence: 99%

Analysis of Failure Modes in Kesterite Solar Cells

Grenet

Suzon

Emieux

et al. 2018

ACS Appl. Energy Mater.

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An intense research activity has been carried out in the past few years to improve efficiencies and understand limitations in kesterite based solar cells. Despite notable efforts to determine and list the different failure modes affecting the photovoltaic properties of these devices, very few works try to quantify and classify the effect of these failure modes. In this study, an exhaustive literature review has first been conducted to determine the different causes leading to limited efficiencies in kesterite devices with an additional focus on cadmium free and critical raw material free devices. Second, an original approach has been employed to quantify the impact of these failure modes on solar cells with the evaluation of feedbacks from 18 scientific experts working on kesterite technology. The result of this survey is analyzed, which allow to determine what should be the research priority for the community to improve efficiencies and drive kesterite technology to the market.

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Ordering kesterite improves solar cells: A low temperature post-deposition annealing study

Cited by 62 publications

References 46 publications

Cation Disorder In Cu₂ZnSnS₄Thin Films: Effect On Solar Cell Performances

Cation Disorder In Cu₂ZnSnS₄Thin Films: Effect On Solar Cell Performances

Optical properties of Cu_2ZnSnSe_4 thin films and identification of secondary phases by spectroscopic ellipsometry

Analysis of Failure Modes in Kesterite Solar Cells

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Ordering kesterite improves solar cells: A low temperature post-deposition annealing study

Cited by 62 publications

References 46 publications

Cation Disorder In Cu2ZnSnS4Thin Films: Effect On Solar Cell Performances

Cation Disorder In Cu2ZnSnS4Thin Films: Effect On Solar Cell Performances

Optical properties of Cu_2ZnSnSe_4 thin films and identification of secondary phases by spectroscopic ellipsometry

Analysis of Failure Modes in Kesterite Solar Cells

Contact Info

Product

Resources

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Cation Disorder In Cu₂ZnSnS₄Thin Films: Effect On Solar Cell Performances

Cation Disorder In Cu₂ZnSnS₄Thin Films: Effect On Solar Cell Performances