GaN基外延膜的激光剥离和InGaNLD外延膜的解理
Thin film GaN-based membranes by laser lift-off and cleaved In GaN LD facet
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摘要: 利用波长为248nm的KrF准分子激光器进行了蓝宝石衬底GaN外延层剥离。对极薄的MOCVD生长的单层GaN外延膜(3μm)和InGaNLD外延膜(5μm)实现了大面积剥离。对剥离蓝宝石衬底背面抛光和未抛光外延片的不同特点作了比较,激光剥离所需的能量密度阈值分别约为200mJ/cm2和300mJ/cm2,优化结果表明,能量密度分别在400mJ/cm2和600mJ/cm2可实现稳定的剥离。同时对剥离后的InGaN多量子阱LD结构薄膜进行了解理,SEM观察显示获得的InGaNLD腔面平整光滑。基于这种技术可以获得无蓝宝石衬底的GaN基光电子和电子器件。Abstract: Thin gallium nitride films,grown on sapphire substrates by MOCVD,are debonded by laser-induced lift-off. 3μm thick GaN membranes and 5μm thick InGaN MQW LD membranes are successfully separated from the growth substrates using KrF pulsed-excimer laser.Characterization of laser lift-off technology between wafers with sapphire substrates backside polished and wafers with sapphire substrates backside unpolished are compared.The threshold intensities are about 200mJ/cm2 and 300mJ/cm2 for these two kinds of wafers,and incident pulse intensities of 400mJ/cm2 and 600mJ/cm2 were required for stable interface splitting respectively. The InGaN MQW LD films are transfired onto a Si or InP support substrate and then cleaved. SEM was employed to analyze the cleaved facet. It can be concluded that the cleaved facet is ideal. GaN-based opto-electronic and electronic devices without sapphire substrate are available with this technology.
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[1] NAKAMURA S.J Cryst Growth,1997,170:11~15. [2] MORKOC H,STRITE S,GAO G B et al.J A P,1994,76:1363~1398. [3] STEIGERWALD D A,BHAT J C,COLLINS D et al. IEEE Journal on Selected Topics in Quantum Electronics,2002,8:310~320. [4] KELLY M K,AMBACHER O,DAHLHEIMER B et al.A P L,1996,69:1749~1752. [5] WONG W S,SANDS T,CHEUNG N W et al.A P L,1998:72:599~602. [6] WONG W S,SANDS T,CHEUNG N W et al.A P L,1999,75:1360~1363. [7] WONG W S,KNEISSL M,MEI P et al.A P L,2001,78:1198~1201. [8] JOHNSON J W,LAROCHE J,REN F.Solid-State Electron,2001,45:405~410. [9] MORITA D,SANO M,YAMAMOTO M et al.J A P,2002,41:1434~1436. [10] KELLY M K,VAUDO R P,PHANSE V M et al.Japan J A P,1999,38:217~219. [11] STACH E A,KELSCH M,NELSON E C et al.A P L,1999,77:1819~1822. [12] MARTIN R W,KIM H S,CHO Y et al.Materials Science and Engineering,2002,B93:98~101. [13] 童玉珍.GaN及其三元化合物的MOCVD生长和性质及蓝光LED的研究.北京大学博士毕业论文,1999.68. [14] KAWASHIMA T,YOSHIKAWA H,ADACHI S et al.J A P,1997,82:3528~3535.
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