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重庆京东方光电科技有限公司, 重庆 400700
Received:06 December 2018,
Accepted:24 April 2019,
Published:05 June 2019
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Mao-kun TIAN, Xiao-nan DONG, Zhong-hao HUANG, et al. Ternary composites of passivation layer for hole plasma etching of IGZO-TFT[J]. Chinese journal of liquid crystals and displays, 2019, 34(6): 564-569.
Mao-kun TIAN, Xiao-nan DONG, Zhong-hao HUANG, et al. Ternary composites of passivation layer for hole plasma etching of IGZO-TFT[J]. Chinese journal of liquid crystals and displays, 2019, 34(6): 564-569. DOI: 10.3788/YJYXS20193406.0564.
IGZO-TFT钝化层设计三元复合过孔结构,出现了20%过孔相关不良。本文以CF
4
/O
2
为反应气体,采用控制变量法,从功率、气体成分和比例、压力等方面对氧化物TFT钝化层的电感耦合等离子体刻蚀机理进行研究。当钝化层为SiO
2
或SiN
x
单组分时,氧气可以促进刻蚀反应;随着CF
4
/O
2
比例增加,刻蚀速率先增大后趋于稳定,并且当CF
4
/O
2
=15/8时,刻蚀速率和均一性达到最优;与源功率相比,提高偏压功率在提升刻蚀速率中起主导作用,同时均一性控制在15%以内;当压力在4 Pa以内时,刻蚀速率随着压力的降低而增加。据此分析,对复合结构SiN
x
/SiO
2
、SiO
2
/SiN
x
、SiN
x
/SiO
2
/SiN
x
的刻蚀过程进行优化,得到了形貌规整、无残留物的过孔,过孔相关不良得到100%改善。
For ternary composite
via
-hole in passivation layer
20% relevant defection happened in IGZO TFT manufaction. In this paper
the inductively coupled plasma etching mechanism of the oxide TFT passivation was investigated. Combined the reaction gas CF
4
/O
2
with the control variable method
the impact of power
gas composition
gas ratio and pressure on the project was studied. When the passivation is a single component of SiO
2
or SiN
x
adding oxygen to the reaction gas can promote the etching process. The etching rate and uniformity increase with the ratio of CF
4
/O
2
. Further
the optimum indexs achieve at CF
4
/O
2
=15/8. Compared with the source power
the bias power plays a leading role in increasing the etch rate
while the uniformity is controlled within 15%. The etching rate improves with the decrease of the pressure
within the limit of 4 Pa. Based on this
the etching processes of the composite structure SiN
x
/SiO
2
SiO
2
/SiN
x
SiN
x
/SiO
2
/SiN
x
are optimized. Ultimately
the well-formed
residue-free
via
-holes are obtained and the bad issue occurred in the
via
-hole is completely improved
which provide theoretical guidance for favorable electrical contact with the oxide TFT devices.
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