Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 106-110 |
| Seitenumfang | 5 |
| Fachzeitschrift | Solar Energy Materials and Solar Cells |
| Jahrgang | 173 |
| Publikationsstatus | Veröffentlicht - Dez. 2017 |
Abstract
Polycrystalline silicon (poly-Si) layers on thin silicon oxide films have received strong research interest as they form excellent carrier selective junctions on crystalline silicon substrates after appropriate thermal processing. Recently, we presented a new method to determine the pinhole density in interfacial oxide films of poly-Si on oxide (POLO)-junctions with excellent electrical properties. The concept of magnification of nanometer-size pinholes in the interfacial oxide by selective etching of the underlying crystalline silicon is used to investigate the influence of annealing temperature on pinhole densities. Eventually, the pinholes are detected by optical microscopy and scanning electron microscopy. We present results on the pinhole density in POLO-junctions with J0 values as low as 1.4 fA/cm2. The stability of this method is demonstrated by proving that no new holes are introduced to the oxide during the etching procedure for a wide range of etching times. Finally, we show the applicability to multiple oxide types and thickness values, differently doped poly-Si layers as well as several types of wafer surface morphologies. For wet chemically grown oxides, we verified the existence of pinholes with an areal density of 2×107 cm−2 even already after annealing at a temperature of 750 °C (lower than the optimum annealing temperature for these junctions).
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Energie (insg.)
- Erneuerbare Energien, Nachhaltigkeit und Umwelt
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
Ziele für nachhaltige Entwicklung
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in: Solar Energy Materials and Solar Cells, Jahrgang 173, 12.2017, S. 106-110.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - A simple method for pinhole detection in carrier selective POLO-junctions for high efficiency silicon solar cells
AU - Tetzlaff, D.
AU - Krügener, J.
AU - Larionova, Y.
AU - Reiter, S.
AU - Turcu, M.
AU - Haase, F.
AU - Brendel, R.
AU - Peibst, R.
AU - Höhne, U.
AU - Kähler, J. D.
AU - Wietler, T. F.
PY - 2017/12
Y1 - 2017/12
N2 - Polycrystalline silicon (poly-Si) layers on thin silicon oxide films have received strong research interest as they form excellent carrier selective junctions on crystalline silicon substrates after appropriate thermal processing. Recently, we presented a new method to determine the pinhole density in interfacial oxide films of poly-Si on oxide (POLO)-junctions with excellent electrical properties. The concept of magnification of nanometer-size pinholes in the interfacial oxide by selective etching of the underlying crystalline silicon is used to investigate the influence of annealing temperature on pinhole densities. Eventually, the pinholes are detected by optical microscopy and scanning electron microscopy. We present results on the pinhole density in POLO-junctions with J0 values as low as 1.4 fA/cm2. The stability of this method is demonstrated by proving that no new holes are introduced to the oxide during the etching procedure for a wide range of etching times. Finally, we show the applicability to multiple oxide types and thickness values, differently doped poly-Si layers as well as several types of wafer surface morphologies. For wet chemically grown oxides, we verified the existence of pinholes with an areal density of 2×107 cm−2 even already after annealing at a temperature of 750 °C (lower than the optimum annealing temperature for these junctions).
AB - Polycrystalline silicon (poly-Si) layers on thin silicon oxide films have received strong research interest as they form excellent carrier selective junctions on crystalline silicon substrates after appropriate thermal processing. Recently, we presented a new method to determine the pinhole density in interfacial oxide films of poly-Si on oxide (POLO)-junctions with excellent electrical properties. The concept of magnification of nanometer-size pinholes in the interfacial oxide by selective etching of the underlying crystalline silicon is used to investigate the influence of annealing temperature on pinhole densities. Eventually, the pinholes are detected by optical microscopy and scanning electron microscopy. We present results on the pinhole density in POLO-junctions with J0 values as low as 1.4 fA/cm2. The stability of this method is demonstrated by proving that no new holes are introduced to the oxide during the etching procedure for a wide range of etching times. Finally, we show the applicability to multiple oxide types and thickness values, differently doped poly-Si layers as well as several types of wafer surface morphologies. For wet chemically grown oxides, we verified the existence of pinholes with an areal density of 2×107 cm−2 even already after annealing at a temperature of 750 °C (lower than the optimum annealing temperature for these junctions).
KW - Carrier selective contacts
KW - Pinholes
KW - Polysilicon
KW - Tetramethylammonium hydroxide (TMAH)
UR - http://www.scopus.com/inward/record.url?scp=85019625564&partnerID=8YFLogxK
U2 - 10.1016/j.solmat.2017.05.041
DO - 10.1016/j.solmat.2017.05.041
M3 - Article
AN - SCOPUS:85019625564
VL - 173
SP - 106
EP - 110
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
SN - 0927-0248
ER -