JP2021528847A - 裏面照光センサおよびセンサの製造方法 - Google Patents
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Abstract
【選択図】 図1
Description
[開示の分野]
[0002]本出願は、深UV(DUV)および真空UV(VUV)波長での放射を感知するのに適した画像センサ、およびそのような画像センサを製造するための方法に関する。これらのセンサは、フォトマスク、レチクル、またはウエハ検査システムでの使用やその他の用途に適している。
[0003]以下の説明および例は、本稿に含まれていることから先行技術であるとはみなされない。
[0013]画像センサ、およびDUVおよび/またはVUVを撮像するための高量子効率を有する画像センサを製造する方法が記載される。これらの画像センサは、高束のDUVおよびVUV放射下で長寿命動作が可能である。これらの方法は、半導体(好ましくはシリコン)ウエハ上に感光能動および/または受動回路素子を層で形成する処理ステップと、センサの電気素子間の金属相互接続部を形成する処理ステップとを含む。これらの画像センサは、ボロン層で被覆された裏面と、ボロン層に直接隣接する高濃度にドープされたp型シリコン層とを有しながら、微細な金属相互接続部とビア(約0.35μmまたはこれより微細な設計ルールに準拠するものなど)を備えることができる。金属相互接続部は、タングステン、モリブデン、または他の耐熱(すなわち、高融点)金属を含んでもよい。一実施形態では、金属相互接続部は、耐熱金属のみからなってもよい。一実施形態では、金属相互接続部を形成するために用いられる堆積プロセスは、金属層内の応力を低減するように構成されてもよい。一実施形態では、アルミニウムまたは銅を含む追加の金属相互接続部は、耐熱金属を含む金属相互接続部の上に追加され、それらに接続されてもよい。
[0022]図1は、本発明の例示的な実施形態による深紫外線(DUV)放射、真空紫外線(VUV)放射、極紫外線(EUV)放射、または荷電粒子を感知するように構成された画像センサ100の一部を示す断面側面図である。画像センサ100は、半導体膜101の上(第1の)面101Uに形成された回路素子103と、回路素子103上の誘電材料層112に配置された第1の金属相互接続部110と、半導体膜101の下(第2の)面101Lに形成された純ボロン層106とを備える。
Claims (21)
- 深紫外線(DUV)放射、真空紫外線(VUV)放射、極紫外線(EUV)放射、および荷電粒子の少なくとも1つを感知するための画像センサであって、
半導体膜であって、前記半導体膜の第1の面に形成された回路素子および前記回路素子上に形成された第1の金属相互接続部を備える前記半導体膜と、
前記半導体膜の第2の面に形成された純ボロン層と、を備える画像センサであって、
前記半導体膜が、第2の面から前記半導体膜内へ延びるボロンドープ領域であって、前記純ボロン層に直接隣接して配置される前記ボロンドープ領域を含み、
前記第1の金属相互接続部が耐熱金属を含む、
画像センサ。 - 前記半導体膜が、10μmから40μmの範囲の厚さT1を有するエピタキシャル層を含む、請求項1に記載の画像センサ。
- 前記純ボロン層が、2nmから20nmの範囲の厚さT2を有する、請求項1に記載の画像センサ。
- 前記画像センサが、前記純ボロン層の外向きの面に堆積された反射防止被膜をさらに備える、請求項1に記載の画像センサ。
- 前記回路素子上に形成された保護層をさらに備え、前記保護層は、前記第1の金属相互接続部が前記半導体膜と前記保護層との間に完全に配置されるように形成されている、請求項1に記載の画像センサ。
- 前記保護層が、単結晶シリコンおよびガラスの1つ以上を含む、請求項5に記載の画像センサ。
- 前記第1の金属相互接続部が、タングステンおよびモリブデンのうちの少なくとも1つを含む、請求項1に記載の画像センサ。
- 前記第1の金属相互接続部の上方に配置され、前記回路素子に結合された第2の金属相互接続部をさらに備え、
前記第2の金属相互接続部が、アルミニウムおよび銅のうちの少なくとも1つを含む、請求項1に記載の画像センサ。 - 前記画像センサが、電荷結合素子(CCD)およびCMOS素子のうちの1つを備える、請求項3に記載の画像センサ。
- 深紫外線(DUV)放射、真空紫外線(VUV)放射、極紫外線(EUV)放射、および荷電粒子の少なくとも1つを感知するための画像センサであって、
第1のp型ドーピング濃度を有する半導体膜であって、前記半導体膜の第1の面に形成された回路素子を備える前記半導体膜と、
前記回路素子の少なくとも1つに接続された第1の金属相互接続部であって、耐熱金属を含む前記第1の金属相互接続部と、
前記半導体膜の第2の面に形成された純ボロン層と、
前記純ボロン層に直接隣接して、前記半導体膜に形成されたp型ドープ層と、を備える画像センサであって、
前記p型ドープ層が、前記第1のp型ドーピング濃度よりも高い第2のp型ドーピング濃度を有する、
画像センサ。 - 前記純ボロン層の厚さが2nmから20nmの間であり、
前記半導体膜の厚さが10μmから40μmの間である、
請求項10に記載の画像センサ。 - 前記画像センサが反射防止層または保護層をさらに備え、
前記純ボロン層の前記厚さが3nmから10nmの間である、請求項11に記載の画像センサ。 - 前記第1の金属相互接続部が、タングステンおよびモリブデンのうちの少なくとも1つを含む、請求項11に記載の画像センサ。
- 前記画像センサが、前記第1の金属相互接続部の上方に配置され、前記回路素子に結合された第2の金属相互接続部をさらに備え、
前記第2の金属相互接続部が、アルミニウムおよび銅のうちの少なくとも1つを含む、請求項11に記載の画像センサ。 - 画像センサを製造する方法であって、
基板上にエピタキシャル層を形成するステップと、
前記エピタキシャル層上に回路素子を形成するステップと、
前記回路素子に接続された耐熱金属を含む第1の金属相互接続部を形成するステップと、
前記基板を薄化して、前記エピタキシャル層の少なくとも一部を露出させる薄化基板を形成するステップと、
前記エピタキシャル層の前記露出部分に純ボロン層を形成するステップと、
前記純ボロン層に隣接して前記エピタキシャル層の前記表面にドープ層を形成するステップと、
を含む方法。 - 前記耐熱金属が、タングステンおよびモリブデンのうちの少なくとも1つを含む、請求項15に記載の方法。
- 前記ドープ層を形成するステップが、前記エピタキシャル層を600℃から900℃の間の温度に加熱する工程を含む、請求項15に記載の方法。
- 前記方法が、前記基板を薄化するステップの前に、ハンドリングウエハを前記回路素子に取り付けるステップをさらに含む、請求項15に記載の方法。
- 前記方法が、前記純ボロン層を形成するステップの前に、前記エピタキシャル層および前記ハンドリングウエハのうちの少なくとも1つにビアを形成するステップをさらに含む、請求項18に記載の方法。
- 前記方法が、前記ドープ層を形成するステップの後に、前記ビアを露出するステップをさらに含む、請求項19に記載の方法。
- 前記方法が、前記ドープ層を形成するステップの後に、第2の金属相互接続部を形成するステップをさらに含み、
前記第2の金属相互接続部が、前記回路素子に結合され、
前記第2の金属相互接続部が、アルミニウムおよびタングステンのうちの少なくとも1つを含む、請求項15に記載の方法。
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KR20210020115A (ko) | 2021-02-23 |
CN112424906B (zh) | 2023-12-26 |
DE112019003064T5 (de) | 2021-03-04 |
US11114489B2 (en) | 2021-09-07 |
CN112424906A (zh) | 2021-02-26 |
US20190386054A1 (en) | 2019-12-19 |
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