JP6655301B2 - レーザアニール装置及び薄膜トランジスタの製造方法 - Google Patents
レーザアニール装置及び薄膜トランジスタの製造方法 Download PDFInfo
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- JP6655301B2 JP6655301B2 JP2015102137A JP2015102137A JP6655301B2 JP 6655301 B2 JP6655301 B2 JP 6655301B2 JP 2015102137 A JP2015102137 A JP 2015102137A JP 2015102137 A JP2015102137 A JP 2015102137A JP 6655301 B2 JP6655301 B2 JP 6655301B2
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- 239000010409 thin film Substances 0.000 title claims description 92
- 238000005224 laser annealing Methods 0.000 title claims description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 30
- 239000000758 substrate Substances 0.000 claims description 81
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 50
- 229920005591 polysilicon Polymers 0.000 claims description 49
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 41
- 239000004065 semiconductor Substances 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 8
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 5
- 230000032258 transport Effects 0.000 description 51
- 239000013078 crystal Substances 0.000 description 27
- 238000010586 diagram Methods 0.000 description 11
- 238000003384 imaging method Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Description
また、本発明によれば、前記基板が搬送方向に対して左右に振れながら搬送された場合であっても、前記基板の動きに追従させて前記シャドウマスク(光学系)を移動させることができる。
図1は、本発明によるレーザアニール装置の一実施形態を示す概要図である。図2は、本発明によるレーザアニール装置で成膜されるTFTの一実施形態を示す断面図である。図1に示すレーザアニール装置100は、TFT基板5上のゲート電極に対応した領域のアモルファスシリコン薄膜をレーザアニールにより、TFT18の半導体層を形成するものである。
図5は、本発明によるTFTの製造方法の一例を説明する断面図である。図6は、本発明によるTFTの製造方法の一例を説明する平面図である。ここでは、一例として5ショットのレーザ光Lの照射によりレーザアニールが実行される場合について説明する。
先ず、搬送手段13が制御装置17によって制御されて、TFT基板5を図1に示す矢印A方向に一定速度で搬送を開始する。
図9は、本発明によるレーザアニール装置に使用するシャドウマスクの一構成例を示す図である。図9に示すシャドウマスク21aは、各開口の長手方向と搬送方向が一致するように、各開口の搬送方向と交差する方向の幅を変えて、搬送方向の幅は変えないように形成されている。詳細には、各開口の搬送方向と交差する方向の幅は、搬送方向下流に向かって漸減するように形成されている。上記実施形態では、このシャドウマスク21aを採用して、TFTを製造してもよい。
なお、画像処理部33は、一例として、上記撮像手段16により撮影された画像情報に基づいて搬送方向の輝度変化から、ゲート電極1の搬送方向の縁部(ゲート電極1のX方向の境界線(例えば、図10に示すe4のライン))を第1の検出情報として検出すると共に、搬送方向の輝度変化から搬送方向に垂直に交差して伸びるゲート線6の縁部(例えば、図10に示すe2とe3)の位置を第2の検出情報として検出する。
2…半導体層
3…ソース電極
4…ドレイン電極
5…TFT基板(基板)
7…アモルファスシリコン薄膜
8…ポリシリコン薄膜
10…チャンネル領域
11…ソース領域
12…ドレイン領域
14…レーザ照射光学系
17…制御装置
18…薄膜トランジスタ(TFT)
100…レーザアニール装置
L…レーザ光
Claims (4)
- 一定の配列ピッチでマトリクス状にゲート電極が基板上に形成され、前記基板上に被着されたアモルファスシリコン薄膜にレーザ光を照射してポリシリコン化することにより、前記ゲート電極上に薄膜トランジスタの半導体層を形成するレーザアニール装置であって、
前記半導体層のソース領域及びドレイン領域となるアモルファスシリコン薄膜へのレーザ光の照射量を、前記ソース領域と前記ドレイン領域とに挟まれたチャンネル領域となるアモルファスシリコン薄膜への照射量よりも少なくなるように、前記レーザ光の照射領域を変えて多重照射させる光学系と、
前記光学系における前記レーザ光の照射領域の変更を制御すると共に、前記レーザ光の照射領域を最小とする最小照射領域を、前記チャンネル領域の平面積よりも小さくし、前記最小照射領域に最も多いショット回数でレーザ照射する制御手段と、
を備え、
前記光学系は、前記基板の搬送方向と交差する方向に前記ゲート電極の配列ピッチで同じ開口面積の開口を並べて形成していると共に、前記基板の搬送方向と同方向の前記ゲート電極の配列ピッチで異なる開口面積の開口を複数形成しているシャドウマスクを有し、
前記制御手段は、前記基板をステップ移動させる毎に前記シャドウマスクの前記開口面積の異なる複数の開口に順番に前記レーザ光を通過させて、前記レーザ光の照射幅を段階的に変更すると共に、前記基板が搬送方向に対して左右に振れながら搬送された場合、前記基板の動きに追従させて前記光学系を移動させることを特徴とするレーザアニール装置。 - 前記光学系は、前記シャドウマスクの複数の開口に対応してマイクロレンズを有するマイクロレンズアレイをさらに備え、前記マイクロレンズにより、前記開口の像を前記ゲート電極に対応した領域の前記アモルファスシリコン薄膜上に縮小して合焦させることを特徴とする請求項1記載のレーザアニール装置。
- 基板上にゲート電極、ソース電極、ドレイン電極及び半導体層を積層して備えた薄膜トランジスタの製造方法であって、
一定の配列ピッチでマトリクス状に前記ゲート電極が基板上に形成され、前記基板上に被着されたアモルファスシリコン薄膜にレーザ光を照射してポリシリコン化することにより、前記ゲート電極上に前記半導体層を形成するレーザアニール方法の工程を含み、
前記工程は、前記半導体層のソース領域及びドレイン領域となるアモルファスシリコン薄膜へのレーザ光の照射量を、前記ソース領域と前記ドレイン領域とに挟まれたチャンネル領域となるアモルファスシリコン薄膜への照射量よりも少なくなるように、前記レーザ光の照射領域を変えて多重照射するため、前記基板の搬送方向と交差する方向に前記ゲート電極の配列ピッチで同じ開口面積の開口を並べて形成していると共に、前記基板の搬送方向と同方向の前記ゲート電極の配列ピッチで異なる開口面積の開口を複数形成しているシャドウマスクを介して、前記基板をステップ移動させる毎に前記シャドウマスクの前記開口面積の異なる複数の開口に順番に前記レーザ光を通過させて、前記レーザ光の照射幅を段階的に変更可能とし、前記レーザ光の照射領域を最小とする最小照射領域を、前記チャンネル領域の平面積よりも小さくし、前記最小照射領域に最も多いショット回数でレーザ照射し、前記基板が搬送方向に対して左右に振れながら搬送された場合、前記基板の動きに追従させて前記シャドウマスクを移動させることを特徴とする薄膜トランジスタの製造方法。 - 前記シャドウマスクの複数の前記開口に対応してマイクロレンズを備え、該マイクロレンズにより、前記開口の像を前記ゲート電極に対応した領域の前記アモルファスシリコン薄膜上に縮小して合焦させることを特徴とする請求項3記載の薄膜トランジスタの製造方法。
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