Development of MoOx thin films as back contact buffer for CdTe solar cells in substrate configuration

Gretener, Christina; Perrenoud, J.; Kranz, Lukas; Baechler, Curdin; Yoon, Songhak; Romanyuk, Yaroslav E.; Buecheler, Stephan; Tiwari, Ayodhya N.

doi:10.1016/j.tsf.2012.11.110

Cited by 41 publications

(19 citation statements)

References 24 publications

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“…[13][14][15] Even more important optical gains may be achieved by using highly transparent transition metal oxides as window layers, provided their work function is appropriate for carrier collection. 16,17 Metal oxides, and in particular, sub-stoichiometric molybdenum oxide (MoO x , x < 3), were already investigated as hole collecting materials for organic [18][19][20] and inorganic [21][22][23] thin-film solar cells, as well as for organic light emitting diodes. [26][27][28] For these applications, the metal oxide layer often also protects sensitive underlying layers from sputtering-induced damage during TCO deposition.…”

Section: 5% Efficient Silicon Heterojunction Solar Cell With Molybmentioning

confidence: 99%

22.5% efficient silicon heterojunction solar cell with molybdenum oxide hole collector

Geissbühler

Werner

Nicolás

et al. 2015

Applied Physics Letters

385

328

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Substituting the doped amorphous silicon films at the front of silicon heterojunction solar cells with wide-bandgap transition metal oxides can mitigate parasitic light absorption losses. This was recently proven by replacing p-type amorphous silicon with molybdenum oxide films. In this article, we evidence that annealing above 130 °C—often needed for the curing of printed metal contacts—detrimentally impacts hole collection of such devices. We circumvent this issue by using electrodeposited copper front metallization and demonstrate a silicon heterojunction solar cell with molybdenum oxide hole collector, featuring a fill factor value higher than 80% and certified energy conversion efficiency of 22.5%.

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Section: 5% Efficient Silicon Heterojunction Solar Cell With Molybmentioning

confidence: 99%

22.5% efficient silicon heterojunction solar cell with molybdenum oxide hole collector

Geissbühler

Werner

Nicolás

et al. 2015

Applied Physics Letters

385

328

View full text Add to dashboard Cite

show abstract

“…[3][4][5] Their high work function, large band gap, efficient carrier selectivity, and high transparency make them viable and cost-effective candidates for these applications, where they are employed as protective buffer layers, 6-10 optical spacers [11][12][13] or charge transport layers. [14][15][16][17][18][19][20][21] TMOs are susceptible materials, which are sensitive to their environment, such as air or oxygen exposure, 22 temperature, [23][24][25][26] UV-light, 27 UV-ozone 28 or plasma treatments. [29][30][31][32][33] This is because many TMOs readily undergo redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Parasitic Absorption Reduction in Metal Oxide-Based Transparent Electrodes: Application in Perovskite Solar Cells

Werner

Geissbühler

Dabirian

et al. 2016

ACS Appl. Mater. Interfaces

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Transition metal oxides (TMOs) are commonly used in a wide spectrum of device applications, thanks to their interesting electronic, photochromic, and electrochromic properties. Their environmental sensitivity, exploited for gas and chemical sensors, is however undesirable for application in optoelectronic devices, where TMOs are used as charge injection or extraction layers. In this work, we first study the coloration of molybdenum and tungsten oxide layers, induced by thermal annealing, Ar plasma exposure, or transparent conducting oxide overlayer deposition, typically used in solar cell fabrication. We then propose a discoloration method based on an oxidizing CO2 plasma treatment, which allows for a complete bleaching of colored TMO films and prevents any subsequent recoloration during following cell processing steps. Then, we show that tungsten oxide is intrinsically more resilient to damage induced by Ar plasma exposure as compared to the commonly used molybdenum oxide. Finally, we show that parasitic absorption in TMO-based transparent electrodes, as used for semitransparent perovskite solar cells, silicon heterojunction solar cells, or perovskite/silicon tandem solar cells, can be drastically reduced by replacing molybdenum oxide with tungsten oxide and by applying a CO2 plasma pretreatment prior to the transparent conductive oxide overlayer deposition.

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“…MoO 3−x had metallic conductivity since the deficient oxygen (or oxygen vacancy) was shallow and could be easily formed via partial reduction of MoO 3 [16,17]. Theoretically, metallic molybdenum oxides (MoO 3−x ) possessed a relatively high work function (6.0 eV to 6.6 eV, even larger than noble metal Pd) [18][19][20][21] together with tunable high conductivity [16,22]. Therefore, the Schottky junction is easy to form between metallic MoO 3−x clusters cocatalyst and semiconductor photocatalysts from the aspect of physical electronic structure match.…”

Section: Introductionmentioning

confidence: 99%

In situ one-pot fabrication of MoO3−x clusters modified polymer carbon nitride for enhanced photocatalytic hydrogen evolution

Liu

Wei

et al. 2020

Chinese Journal of Chemical Physics

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Developing low-cost and high-efficient noble-metal-free cocatalysts has been a challenge to achieve economic hydrogen production. In this work, molybdenum oxides (MoO 3−x) were in situ loaded on polymer carbon nitride (PCN) via a simple one-pot impregnation-calcination approach. Different from post-impregnation method, intimate coupling interface between high-dispersed ultra-small MoO 3−x nanocrystal and PCN was successfully formed during the in situ growth process. The MoO 3−x-PCN-X photocatalyst without noble platinum (Pt) finally exhibited enhanced photocatalytic hydrogen performance under visible light irradiation (λ>420 nm), with the highest hydrogen evolution rate of 15.6 µmol/h, which was more than 3 times that of bulk PCN. Detailed structure-performance revealed that such improvement in visible-light hydrogen production activity originated from the intimate interfacial interaction between high-dispersed ultra-small MoO 3−x nanocrystal and polymer carbon nitride as well as efficient charge carriers transfer brought by Schottky junction formed.

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Development of MoOx thin films as back contact buffer for CdTe solar cells in substrate configuration

Cited by 41 publications

References 24 publications

22.5% efficient silicon heterojunction solar cell with molybdenum oxide hole collector

22.5% efficient silicon heterojunction solar cell with molybdenum oxide hole collector

Parasitic Absorption Reduction in Metal Oxide-Based Transparent Electrodes: Application in Perovskite Solar Cells

In situ one-pot fabrication of MoO3−x clusters modified polymer carbon nitride for enhanced photocatalytic hydrogen evolution

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