JP2008182209A - 半導体装置およびそれを用いた電子機器 - Google Patents
半導体装置およびそれを用いた電子機器 Download PDFInfo
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- JP2008182209A JP2008182209A JP2007325374A JP2007325374A JP2008182209A JP 2008182209 A JP2008182209 A JP 2008182209A JP 2007325374 A JP2007325374 A JP 2007325374A JP 2007325374 A JP2007325374 A JP 2007325374A JP 2008182209 A JP2008182209 A JP 2008182209A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
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Abstract
【解決手段】光電変換素子と、ダイオード接続された第1のトランジスタと、第2のトランジスタとを有し、第1のトランジスタのゲートは、第2のトランジスタのゲートに電気的に接続され、第1のトランジスタのソースおよびドレインの一方は、光電変換素子を介して第2のトランジスタのソースおよびドレインの一方に電気的に接続され、第1のトランジスタのソースおよびドレインの他方は、第2のトランジスタのソースおよびドレインの他方に電気的に接続された構成とする。第1のトランジスタと第2のトランジスタに、しきい値電圧が異なるトランジスタを用いることにより、低い光照度においても読み取り可能な半導体装置を得ることができる。
【選択図】図1
Description
本発明の半導体装置の一実施形態を図1を用いて説明する。図1(A)に示す半導体装置は、光電変換素子101、第1回路102、第2回路103、第1端子104、第2端子105を有している。第1回路102は、光電変換素子101と直列に接続されている。そして、第1回路102は、入力された電流、例えば、光電変換素子101に流れる電流に応じた電圧を生成する機能を有している。つまり、第1回路102は、電流電圧変換回路としての機能を有している。第2回路103は、入力された電圧、例えば、光電変換素子101または第1回路102の電圧に応じた電流を生成する機能を有している。つまり、第2回路103は、電圧電流変換回路としての機能を有している。
実施の形態1では、第1回路102がダイオード接続されたNチャネル型トランジスタである場合について述べた。ただし、これに限定されず、第1回路102として、様々な構成を取ることができる。例えば図3に示すように、第1回路と102して、電流電圧変換回路102Aを用いてもよい。
実施の形態1および実施の形態2では、光電変換素子101に照射される光強度が大きくなるにしたがって、出力電流も大きくなる場合について示してきた。本実施の形態では、光電変換素子101に照射される光強度が大きくなるにしたがって、出力電流は小さくなる場合について示す。
実施の形態2では、実施の形態1における第1回路102として、様々な構成を用いた場合について述べた。一方、実施の形態3では、実施の形態1に対して、第1回路102と光電変換素子101との接続が異なる場合について述べた。そこで、本実施の形態でも同様に、実施の形態3における第1回路802として、様々な構成を用いた場合について述べる。
実施の形態1乃至4に記載した半導体装置の応用例について図20を用いて説明する。図20(A)に示す半導体装置は、光電変換装置2001Aおよび2001Bと、抵抗素子2002Aおよび2002Bと、電源2005とを有する。
図1(A)に示した半導体装置の一構成例における部分断面図を図21(A)および(B)に示す。なお、図1(A)の第1回路102にnチャネル型薄膜トランジスタ112を、第2回路103にnチャネル型薄膜トランジスタ113を適用した場合の部分断面図である。また、図1(A)における第1端子104は端子121に、第2端子105は端子122に相当する。
本発明の半導体装置およびその作製方法について説明する。本実施形態では、半導体装置の部分断面図の一例を図22乃至図24に示し、これを用いて説明する。また、図21と同様のものについては同じ符号を用い、その詳細な説明は省略する。
本実施形態ではボトムゲート型薄膜トランジスタを用いて形成した半導体装置およびその作製方法の例を、図25乃至図27を用いて説明する。また、上記実施形態と同様のものについては同じ符号を用い、その詳細な説明は省略する。
本実施形態では、本発明により得られた半導体装置を光センサとして様々な電子機器に組み込んだ例について説明する。本発明が適用される電子機器として、コンピュータ、ディスプレイ、携帯電話、テレビなどが挙げられる。これらの電子機器の具体例を図28乃至図32に示す。なお、ディスプレイは複数の画素を有している。
102 第1回路
103 第2回路
104 第1端子
105 第2端子
111 光電変換層
102A 電流電圧変換回路
102B 抵抗素子
102C Pチャネル型トランジスタ
102D 電流電圧変換回路
102E ダイオード
802 第1回路
803 第2回路
802A 電流電圧変換回路
802B 抵抗素子
802C Pチャネル型トランジスタ
802E ダイオード
1302 第1回路
1303 第2回路
1302A 電流電圧変換回路
1302B 抵抗素子
1302C Nチャネル型トランジスタ
1302E ダイオード
1802 第1回路
1803 第2回路
1802A 電流電圧変換回路
Claims (12)
- 光電変換素子と、ダイオード接続された第1のトランジスタと、第2のトランジスタと、を有し、
前記第1のトランジスタのゲートは、前記第2のトランジスタのゲートに電気的に接続され、
前記第1のトランジスタのソースおよびドレインの一方は、前記光電変換素子を介して前記第2のトランジスタのソースおよびドレインの一方に電気的に接続され、
前記第1のトランジスタのソースおよびドレインの他方は、前記第2のトランジスタのソースおよびドレインの他方に電気的に接続され、
前記第1のトランジスタと前記第2のトランジスタとでは、しきい値電圧が異なることを特徴とする半導体装置。 - 第1端子と、第2端子と、フォトダイオードと、ダイオード接続された第1のトランジスタと、第2のトランジスタと、を有し、
前記フォトダイオードの陰極端子は前記第1端子に電気的に接続され、
前記フォトダイオードの陽極端子は前記第1のトランジスタのゲート、前記第1のトランジスタのソースおよびドレインの一方および前記第2のトランジスタのゲートに電気的に接続され、
前記第1のトランジスタのソースおよびドレインの他方は前記第2端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの一方は前記第1端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの他方は前記第2端子に電気的に接続され、
前記第1のトランジスタは、前記第2のトランジスタよりもしきい値電圧が大きいことを特徴とする半導体装置。 - 第1端子と、第2端子と、フォトダイオードと、ダイオード接続された第1のトランジスタと、第2のトランジスタと、を有し、
前記フォトダイオードの陰極端子は前記第1のトランジスタのソースおよびドレインの一方および前記第2のトランジスタのゲートに電気的に接続され、
前記フォトダイオードの陽極端子は前記第2端子に電気的に接続され、
前記第1のトランジスタのソースおよびドレインの他方およびゲートは前記第1端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの一方は前記第1端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの他方は前記第2端子に電気的に接続され、
前記第1のトランジスタは、前記第2のトランジスタよりもしきい値電圧が大きいことを特徴とする半導体装置。 - 第1端子と、第2端子と、フォトダイオードと、ダイオード接続された第1のトランジスタと、第2のトランジスタと、を有し、
前記フォトダイオードの陰極端子は前記第1端子に電気的に接続され、
前記フォトダイオードの陽極端子は前記第1のトランジスタのソースおよびドレインの一方および前記第2のトランジスタのゲートに電気的に接続され、
前記第1のトランジスタのソースおよびドレインの他方およびゲートは前記第2端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの一方は前記第1端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの他方は前記第2端子に電気的に接続され、
前記第1のトランジスタは、前記第2のトランジスタよりもしきい値電圧が大きいことを特徴とする半導体装置。 - 第1端子と、第2端子と、フォトダイオードと、ダイオード接続された第1のトランジスタと、第2のトランジスタと、を有し、
前記フォトダイオードの陰極端子は前記第1のトランジスタのゲート、前記第1のトランジスタのソースおよびドレインの一方および前記第2のトランジスタのゲートに電気的に接続され、
前記フォトダイオードの陽極端子は前記第2端子に電気的に接続され、
前記第1のトランジスタのソースおよびドレインの他方は前記第1端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの一方は前記第1端子に電気的に接続され、
前記第2のトランジスタのソースおよびドレインの他方は前記第2端子に電気的に接続され、
前記第1のトランジスタは、前記第2のトランジスタよりもしきい値電圧が大きいことを特徴とする半導体装置。 - 請求項1乃至請求項5のいずれか一項において、
前記第1のトランジスタは、エンハンスメント型のトランジスタであることを特徴とする半導体装置。 - 請求項1乃至請求項6のいずれか一項において、
前記第2のトランジスタは、デプレッション型のトランジスタであることを特徴とする半導体装置。 - 請求項1乃至請求項7のいずれか一項において、
前記第1のトランジスタと前記第2のトランジスタのしきい値電圧の差は、1V以上であることを特徴とする半導体装置。 - 請求項1乃至請求項8のいずれか一項において、
前記第1のトランジスタと前記第2のトランジスタは同じ導電型のトランジスタであることを特徴とする半導体装置。 - 請求項1乃至請求項9のいずれか一項において、
前記第2のトランジスタと並列に1以上のトランジスタが電気的に接続されていることを特徴とする半導体装置。 - 第1端子と、第2端子と、フォトダイオードと、抵抗素子と、トランジスタと、を有し、
前記フォトダイオードの陰極端子は前記第1端子に電気的に接続され、
前記フォトダイオードの陽極端子は前記抵抗素子の第1端子および前記トランジスタのゲートに電気的に接続され、
前記抵抗素子の第2端子は前記第2端子に電気的に接続され、
前記トランジスタのソースおよびドレインの一方は前記第1端子に電気的に接続され、
前記トランジスタのソースおよびドレインの他方は前記第2端子に電気的に接続されていることを特徴とする半導体装置。 - 請求項1乃至請求項11のいずれか一項に記載の前記半導体装置を有することを特徴とする電子機器。
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Also Published As
Publication number | Publication date |
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JP2016085222A (ja) | 2016-05-19 |
US20120049185A1 (en) | 2012-03-01 |
CN101210845A (zh) | 2008-07-02 |
US8058675B2 (en) | 2011-11-15 |
JP2014187395A (ja) | 2014-10-02 |
US20080246064A1 (en) | 2008-10-09 |
US8288807B2 (en) | 2012-10-16 |
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