CN1633699A - 电荷控制雪崩光电二极管及其制造方法 - Google Patents

电荷控制雪崩光电二极管及其制造方法 Download PDF

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CN1633699A
CN1633699A CNA038030500A CN03803050A CN1633699A CN 1633699 A CN1633699 A CN 1633699A CN A038030500 A CNA038030500 A CN A038030500A CN 03803050 A CN03803050 A CN 03803050A CN 1633699 A CN1633699 A CN 1633699A
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柯呈佶
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    • H01L31/1075—Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier the potential barrier working in avalanche mode, e.g. avalanche photodiodes in which the active layers, e.g. absorption or multiplication layers, form an heterostructure, e.g. SAM structure
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Abstract

本发明包括在半绝缘InP结构上生长的外延结构。首先，生长缓冲层以隔离由基片产生的缺陷。然后生长n－型层用作收集电子的n－接触层。接着，生长倍增层向APD设备提供雪崩增益。之后，通过碳掺杂生长超薄电荷控制层。生长吸收层作为由光激发产生电子空穴对的区域。最后，生长p－型层作为收集空穴的P接触层。

Description

电荷控制雪崩光电二极管及其制造方法
技术领域
本发明大体上涉及基于半导体的光电探测器领域，更特别地，涉及最优化的雪崩光电二极管及其制造方法。
背景技术
由于已知的光子和电子间的相互作用，近些年在光电探测器领域取得了巨大的进展，特别是在利用半导体材料的光电探测器领域。一种基于半导体的光电探测器称作雪崩光电二极管，或者APD。这种类型的结构通常由大量用作不同的目的，例如吸收和倍增的固体半导体材料构成。
APD结构通过激发态电荷载流子的行为提供大增益的主要益处，激发态电荷载流子在倍增层中产生大量的电子空穴对。然而，APD产生大量电荷载流子是如此地高效以致于有被饱和的危险，从而对器件带宽产生有害影响。为了防止电荷载流子崩溃，强制电场在APD内自我调控，且特别地期望使倍增层中的电场显著地高于吸收层中的电场。
传统上，隔离吸收、分级、电荷、倍增(SAGCM)APD利用分级层(grading layer)使异质界面的空穴俘获(hole trapping)最小化，利用电荷控制层隔离吸收层和倍增层之间的电场。该电荷控制层的设计是极其关键的，因为要允许倍增层中的电场强度足够高以发起碰撞电离，同时保持吸收层中的电场较低以防止隧道崩溃。
例如，具有n-型倍增层的SAGCM APD结构，电子被扩增并且需要p-型掺杂起电荷控制层作用。然而，传统的铍或锌p-型掺杂方法需要相对厚的电荷控制层，因为铍或锌伴随有高扩散系数。由于该具有更低掺杂的厚电荷控制区域，载流子通过电荷控制层的渡越时间(transit time)增加，从而降低了APD设备的整体速度。
作为比较，在本发明中，铍或锌电荷控制层中存在的限制通过利用碳掺杂被克服了。这一解决方法导致了超薄电荷控制层，同时增加了光电探测器的速度。因为碳具有很小的扩散系数，所以能够获得精确的掺杂控制，从而能够实现具有100埃或者更小厚度超薄层的电荷薄层(charge sheet)。
本发明包括在半绝缘InP结构上生长的外延结构。首先，生长缓冲层以隔离由基片产生的缺陷。然后生长n-型层用作收集电子的n-接触层。接着，生长倍增层(multiplication layer)向APD设备提供雪崩增益。之后，通过碳掺杂生长超薄电荷控制层。生长吸收层作为由光激发产生电子空穴对的区域。最后，生长p-型层作为收集空穴的P接触层。本发明进一步的实施例和优点在下面通过参考附图加以讨论。
附图简述
图1是根据本发明一个方案的电荷控制雪崩光电二极管的透视图。
图2是描述电场空间依赖的曲线图，其中电场跨电荷控制雪崩光电二极管的深度来设置。
优选实施例详细说明
根据本发明的优选实施例，出于光电导目的提供了一种外延结构。光电导结构是雪崩光电二极管(APD)，其通过电荷控制层加以优化以提高性能。本发明结构和制造方法的详情在这里进一步加以讨论。
参考图1，显示了根据优选实施例的电荷控制APD 10的透视图。基片12被提供作为沉积外延结构的基础。本发明的电荷控制APD可以用多种合适的方式加以制造，包括分子束外延和金属有机汽相外延。
基片12可以由半绝缘材料构成，或者选择地，基片可以掺杂磷酸铟(InP)。在基片12上布置缓冲层14使基片12的任何结构缺陷或者化学缺陷与其余的结构隔离。
在缓冲层14上布置n-型层16作为n-接触层，从而收集泻落(cascading)通过电荷控制APD 10的电子。n-型层可以由磷酸铟(InP)或者铝砷化铟(InAlAs)中的一种构成。在n-型层16上布置由InAlAs构成的倍增层18。倍增层18提供雪崩效应，其中电子的电流密度被放大，借此提供APD增益。
在倍增层18上布置电荷控制层20从而使倍增层18与电荷控制APD 10的顶层隔离。在优选实施例中，电荷控制层20由碳掺杂的InAlAs构成。电荷控制层20仅沉积小于100埃的厚度。有可能使电荷控制层20的厚度小至2埃，从而代表二维电荷薄层。因此优选地，电荷控制层20的厚度为2-100埃。
在吸收层24的上下布置两个数字分级层(digistal graded layer)22，26，以便使由于镓砷化铟(InGaAs)和InAlAs材料之间的能带隙产生的任何载流子俘获最小化。第一数字分级层22布置在电荷控制层20上。用于产生电子空穴对的吸收层24布置在数字分级层22上。然后在吸收层24上布置第二数字分级层26。
在优选实施例中，第一和第二数字分级层22，26都由铝镓砷化铟(InAlGaAs)构成。吸收层24由InGaAs构成，以便使通过光激发产生的电子空穴对数量最大。
用作p-接触层的p-型层28布置在第二数字分级层26上，以便按照和n-型层16类似的方式收集空穴。p-型层26优选地是InP或者InAlAs之一，如同上面对于n-型层16的说明。在相关实施例中，p-型层28和n-型层16可以用相同材料制成，或者选择地，它们可以用InP或者InAlAs系列中的不同材料构成。
参考图1说明的电荷控制APD 10比典型的外延APD提供了极大改良的性能。特别地，电荷控制层20特别适合于维持倍增层18中的高电场，同时维持吸收层24中的低电场。
图2是表示电场值的曲线图，其测量了电荷控制APD 10的深度对各种偏压的依赖性。特别地，注意到吸收层24典型地布置为距离p-型层28的表面0.25-1.25μm。类似地，倍增层18可以布置为距离p-型层28的表面1.25-1.75μm。
因此，从图2显见，位于吸收层24和倍增层18之间的电荷控制层20负责各个层之间的电场的增加。特别地，对于-5V偏压，吸收层24中的电场大约为0，而倍增层18中的电场处于-1.75×103V/cm的量级。对于-30伏特的电压，吸收层24中的电场大约为-1.0×103V，而倍增层18中的电场处于-5.0×103V/cm的量级。而且，因为电荷控制层20的厚度小于100埃，所以还使载流子渡越时间显著降低，导致APD响应时间整体增效。
如上所述，本发明包括具有电荷控制层的雪崩光电二极管。特别地，电荷控制层是碳掺杂的，且厚度小于100埃，借此增大了器件吸收层和倍增层之间的电场梯度。对于本领域技术人员应当显而易见，上述实施例只是本发明许多可能具体实施例的少数几个实例。本领域技术人员能够容易地设计大量的各种其它布置而不背离由随后的权利要求限定的本发明的精神和范围。

Claims (19)

1.一种雪崩光电二极管，包括：
位于一基片层上的吸收层；
位于该基片层上的倍增层；和
碳掺杂电荷控制层，其位于吸收层和倍增层之间。
2.根据权利要求1的雪崩光电二极管，其中吸收层位于第一数字分级层和第二数字分级层之间。
3.根据权利要求1的雪崩光电二极管，进一步包括位于倍增层和基片之间的n-型接触层。
4.根据权利要求1的雪崩光电二极管，进一步包括p-型接触层。
5.根据权利要求1的雪崩光电二极管，进一步包括位于n-型接触层和基片之间的缓冲层。
6.根据权利要求1的雪崩光电二极管，其中吸收层是InGaAs。
7.根据权利要求1的雪崩光电二极管，其中倍增层是InAlAs。
8.根据权利要求1的雪崩光电二极管，其中碳掺杂电荷控制层是碳掺杂InAlAs。
9.根据权利要求1的雪崩光电二极管，其中碳掺杂电荷控制层的厚度为2-100埃。
10.根据权利要求1的雪崩光电二极管，其中碳掺杂电荷控制层的厚度为5-50埃。
11.根据权利要求1的雪崩光电二极管，其中碳掺杂电荷控制层的厚度为5-35埃。
12.根据权利要求2的雪崩光电二极管，其中第一数字分级层是InAlGaAs，而第二数字分级层是InAlGaAs。
13.根据权利要求3的雪崩光电二极管，其中n-型接触层是InP或者InAlA之一。
14.根据权利要求4的雪崩光电二极管，其中p-型接触层是InP或者InAlAs之一。
15.一种制造雪崩光电二极管的方法，包括如下步骤：
提供基片层；
沉积倍增层；
沉积碳掺杂电荷控制层；和
沉积吸收层。
16.根据权利要求15的方法，进一步包括沉积n-型层以收集电子的步骤。
17.根据权利要求15的方法，进一步包括沉积p-型层以收集空穴的步骤。
18.根据权利要求15的方法，进一步包括沉积用于防止带隙偏移(bandgap offsets)之间的载流子俘获的数字分级层的步骤。
19.根据权利要求15的方法，进一步包括以碳掺杂InAlAs材料的步骤。
CNA038030500A 2002-02-01 2003-02-03 电荷控制雪崩光电二极管及其制造方法 Pending CN1633699A (zh)

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CN103268898A (zh) * 2013-04-18 2013-08-28 中国科学院半导体研究所 一种雪崩光电探测器及其高频特性提高方法
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