TW202044429A - 電子電路裝置及電子電路裝置的製造方法 - Google Patents

電子電路裝置及電子電路裝置的製造方法 Download PDF

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Publication number
TW202044429A
TW202044429A TW109110633A TW109110633A TW202044429A TW 202044429 A TW202044429 A TW 202044429A TW 109110633 A TW109110633 A TW 109110633A TW 109110633 A TW109110633 A TW 109110633A TW 202044429 A TW202044429 A TW 202044429A
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electronic circuit
wiring
photosensitive resin
layer
photolithographic
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TW109110633A
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English (en)
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明島周三
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日商萊新科技股份有限公司
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Publication of TW202044429A publication Critical patent/TW202044429A/zh

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Abstract

本發明相關之電子電路裝置具備至少一個係為電子電路元件的半導體晶片與由絕緣性之感光性樹脂層而成的重佈線層，所述絕緣性之感光性樹脂層一併包有半導體晶片之連接端子的形成面及側面，並且具有「與半導體晶片之連接端子電性連接之深度相異之多個光刻導孔佈線」及「在與半導體晶片之連接端子的形成面平行的同一面上電性連接各個光刻導孔佈線的佈線」，各個光刻導孔佈線係「與半導體晶片之連接端子連接的底部」與「側壁」連續的桶狀，相對於底部與相反側之上部之間的中間部之孔面，上部的孔面狹小。

Description

電子電路裝置及電子電路裝置的製造方法
本發明係關於電子電路裝置及電子電路裝置的製造方法。尤其係關於能確保適於系統整合化之扇出型晶圓級封裝（FOWLP）之可靠性，以低成本三維封裝的電子電路裝置及其製造方法。
於構成有高階積體電路的積體電路元件（稱作半導體晶片。），有多種封裝已經實用化。舉例而言，晶圓級封裝（WLP）、FOWLP近年來已實用化。此FOWLP依半導體晶片對基板的設置方向，有稱作Face-Up型與Face-Down型者。
Face-Up型由於係先將所內包之各半導體晶片固定於基底基板後再進行加工處理，故不易受到製造工序中之震動或密封樹脂之熱膨脹等的影響，適於要求精度的FOWLP。近年來的Face-Up型，會在將接合於「固定於基底基板之各半導體晶片的連接端子」之上的Cu導柱（pillar）以密封樹脂封膠（mold）之後，以使之對施以化學機械研磨（Chemical Mechanical Polishing：CMP）而露出之Cu導柱的前端部呈電性連接的方式，堆疊重配置佈線結構（重佈線層）。
另一方面，Face-Down型會在將設置有半導體晶片之連接端子的面中介接合劑接合於支撐體之後，將整個半導體晶片以樹脂封膠，之後對此支撐體進行剝離處理，使半導體晶片的接點露出。於此露出面之上堆疊形成重佈線層。
尤其Face-Up型之FOWLP，尤其適於利用多個半導體晶片的系統整合化，不需要通常的印刷電路基板，因而變薄、佈線長度亦變短，故電感或雜散電容亦變小，還可實現訊號之傳送速度的高速化。
『專利文獻』 《專利文獻1》：美國專利第8643164號公報 《專利文獻2》：美國專利申請公開第2017/0025380號說明書 《專利文獻3》：國際專利公開第2010/101163號
『非專利文獻』 《非專利文獻1》：Chien-Fu Tseng, Chung-Shi Liu, Chi-Hsi Wu, and Douglas Yu, "InFO (Wafer Level Integrated Fan-Out) Technology", 2016 IEEE 66th Electronic Components and Technology Conference, USA, Electronic Components and Technology Conference, 2016, DOI 10.1109/ECTC.2016.65
然而，在此種Face-Up型的FOWLP中，需要於所內包之半導體晶片的連接端子之上以高精度形成Cu導柱、平坦度高的樹脂封膠、之後的CMP加工、重佈線層的堆疊這類複雜且高價的製造工序。再者，在以系統整合化為目標進行三維化的情形中，亦已實現「使用具有佈線層之基底基板，並亦於此基底基板的連接端子之上垂直形成有長Cu導柱」的Face-Up型之三維FOWLP。於此種三維FOWLP，必須在同時且無偏移之下形成較半導體晶片厚度還要長之Cu導柱與較半導體晶片厚度還要短之Cu導柱（形成於半導體晶片之連接端子之上者），因而成為更為複雜且高價之物。並且，混合搭載晶片厚度相異之不同種類的半導體晶片雖亦已有人研究，但由於數種長度相異的Cu導柱紛雜存在，以致仍無法解決「確保樹脂封膠的平坦性」等良率穩定性的問題。
然而，就市場而言，期望使用FOWLP結構之「半導體晶片之低價且高度的系統整合化」。舉例而言，期望可以低價實現使2片半導體晶片堆疊之三維化或使不同種類之2片半導體晶片並列。此係因透過三維化，厚度雖會有相當於數百μm左右之半導體封裝厚度的增加，但可減少封裝面積之故。尤其，應用處理器並非獨自運作，而係外接大容量動態隨機存取記憶體（DRAM）或快閃記憶體（Flash記憶體）運作。而且，應用處理器藉由三維FOWLP，可實現利用經堆疊之DRAM或Flash記憶體的非特殊之標準封裝與寬的資料匯流排寬度來進行大量的資料傳輸。並且，由於透過實現不同種類之半導體晶片的並列化，能夠輕易利用FOWLP結構以高自由度搭載多片晶片，故期待可將作為可輕易對應顧客或市場要求之單一模組的適用範圍擴大。
於是，本發明之一實施型態的目的在於：藉由提供適於半導體晶片之系統整合化之低價且可靠性有保證的FOWLP結構及製造方法，以在利用晶片之堆疊的三維化或晶片的並列化中解決高成本或高速化之阻礙以及可靠性之降低這樣的課題。
本發明之一實施型態相關之電子電路裝置具備至少一個電子電路元件與由絕緣性之感光性樹脂層而成的重佈線層，所述絕緣性之感光性樹脂層一併包有電子電路元件之連接部的形成面及側面，並且具有「與電子電路元件之連接部電性連接之深度相異的多個光刻導孔佈線」及「在與電子電路元件之連接部的形成面平行的同一面上電性連接各個光刻導孔佈線的佈線」。各個光刻導孔佈線的特徵在於為「與電子電路元件之連接部連接的底部」與「側壁」連續的桶狀，相對於底部與相反側之上部之間的中間部之孔面，上部的孔面狹小。
本發明之一實施型態相關之電子電路裝置的製造方法，其特徵在於：形成包有「至少1個電子電路元件之連接部之形成面及側面」的絕緣性之感光性樹脂層，並形成「與電子電路元件之連接部電性連接之深度相異的多個光刻導孔佈線」及「在與電子電路元件之連接部的形成面平行的同一面上電性連接各個光刻導孔佈線的佈線」，各個光刻導孔佈線係藉由控制由選擇性曝光所致之指定範圍的曝光量，形成「與電子電路元件之連接部連接的底部」與「側壁」連續的桶狀，並且係以「相對於底部與相反側之上部之間的中間部之孔面，上部的孔面狹小」的方式來形成。
藉由本發明，可在解決高速化之阻礙並保證可靠性的同時以低價實現適於半導體晶片之系統整合化的FOWLP結構。
以下參照圖式來說明本發明相關之電子電路裝置、電子資訊終端及電子電路裝置的製造方法之一實施型態。於此，揭示使用應用處理器晶片等半導體積體電路元件作為電子電路元件的半導體裝置之例。電子電路裝置、電子電路裝置之支撐部件及電子電路裝置的製造方法，能夠以諸多相異之態樣來實施，並非受以下所示之實施型態的記載內容限定解釋者。此外，在本實施型態所參照的圖式中，於相同部分會加上相同的符號，省略其重複之說明。
圖1係本發明之實施型態相關之半導體裝置40的剖面圖。此半導體裝置40係多半形成為暫時性晶圓或暫時性面板的形狀者，簡言之，圖中之左右兩端與相同之構造的半導體裝置40相連，並會在之後的工序中晶粒化。
半導體裝置40具備基底基板、以FACE-UP的方式搭載於基底基板內之佈線層13之上的應用處理器晶片（半導體元件、第1電子電路元件）33，以及重佈線層42。重佈線層42係由包有此晶片33之薄膜狀的感光性樹脂21而成。此晶片33的厚度為約70 μm左右，感光性樹脂層21為約100 μm左右的厚度。
如圖1所示，在本實施型態中，基底基板包含基板11、形成於基板11上的離型層12，與形成於離型層12上的佈線層13。此佈線層13之厚度為約30 μm～50 μm，預先形成有多層的佈線結構（在圖中雖繪示為3層，但層數不限於此）。
基板11具有相依於製造設備的形狀，係由擁有透光性與剛性之玻璃或塑膠或者不透明的矽或金屬等材質而成。於此基板11上形成有離型層12，離型層12的材料係由接合層與純剝離層而成。藉由利用雷射處理將此離型層12剝離，而於最終拆除基板11。
佈線層13係預先準備於基板11上之物。此佈線層具有多層結構，各層皆具有經圖案化之銅佈線層15&17&19、使銅佈線層15&17&19之間絕緣的絕緣層14，以及進行銅佈線層15&17&19之層間連接的導孔18&18’。由於離型層12會於之後剝離，故形成有與離型層12相接，由防焊漆（solder resist）或其他絕緣層所構成的絕緣層16。不存在絕緣層16的部分為銅佈線層15，會作為接墊發揮功能（以後亦稱作接墊15）。
在本實施形態中，基底基板繪示為包含基板11、離型層12與佈線層13之構造。然而並不受限於此，基底基板可僅由基板11所構成，亦可僅由具有在製造工序上無礙且充分之硬度的佈線層13所構成。無論如何，直到最終製品，佈線層13都會留存。
將晶片33中介接合層34牢牢接合於預先準備之基底基板的佈線層13上。晶片33係以具有多個接墊（連接部）之電路形成面朝向與基底基板相反之側的方式來進行Face-Up搭載。在本實施型態中，晶片33配置了1個，但亦可配置2個以上。
於晶片33之上形成有絕緣性之感光性樹脂層21，此感光性樹脂層21在基底基板之上完全包有晶片33。感光性樹脂層21包有晶片33之多個接墊的形成面及側面。晶片33嵌埋於感光性樹脂層21的內部，整個上側面因感光性樹脂層21而平坦化。於此，晶片33之多個接墊的形成面相當於圖中上側面。感光性樹脂層21在基底基板上的厚度與感光性樹脂層21在晶片33上的厚度相異。感光性樹脂層21的厚度（基底基板上的厚度）以能形成光刻導孔的厚度為最大值，但仍要以與微影工序的關係來決定。在聚矽氧系之感光性樹脂（常溫下之楊氏模數為1 GPa以下，120℃下則為0.1 GPa以下，會在曝光量800 mJ/cm2 以上且2600 mJ/cm2 以下感光的此類樹脂）中，已證實厚度至180 μm～200 μm左右可形成光刻導孔而無品質上之問題。並且，感光性樹脂層21為了確實包有晶片33同時抑制厚度，其與具有接墊之晶片面重疊的區域之厚度以5 μm以上且50 μm以下為佳。
重佈線層42包含感光性樹脂層21與銅佈線層44。感光性樹脂層21包含：將係為晶片33之一部分之接墊露出的導孔洞43，與將基底基板內佈線層13之銅佈線層19之接墊露出的導孔洞41。銅佈線層44包含配置於導孔洞43之內側面及底面上的光刻導孔佈線44a（第1光刻導孔佈線）、配置於與晶片33之設置有接墊之晶片面大略平行之面的佈線44b，與配置於導孔洞41之內側面及底面上的光刻導孔佈線44c（第2光刻導孔佈線）。此光刻導孔佈線44a及44c之一部分係電源線或接地線，並且構成電源線或接地線的光刻導孔佈線44a及44c已多重化成可應對可能的斷線損傷。佈線44b大略平行配置於感光性樹脂層21之基底基板側的面（下側面）與和基底基板相反之側的面（上側面）之間。在本實施形態中，「配置於導孔洞43之內側面及底面上的光刻導孔佈線44a」、「佈線44b」與「配置於導孔洞41之內側面及底面上的光刻導孔佈線44c」係為一體。亦即，光刻導孔佈線44a、佈線44b與光刻導孔佈線44c在同一面連接。然而並不受限於此，光刻導孔佈線44a、佈線44b與光刻導孔佈線44c只要電性連接即可。藉由具有此種構造，晶片33與佈線層13中介銅佈線層44透過包含晶片33的重佈線層42三維連接。
在配置於導孔洞41及43的光刻導孔佈線44a及44c之內側面，配置有構成感光性樹脂層21之具絕緣性的感光性樹脂。亦即，在光刻導孔佈線44a及44c的內側填充有感光性樹脂層21。藉由在光刻導孔佈線44a及44c的內側填充感光性樹脂，毋須以金屬鍍覆埋覆整個光刻導孔佈線44a及44c這般高價且複雜的製造工序，即可形成將佈線44b、光刻導孔佈線44a及44c一體化的銅佈線層。據此，可抑制因追加特別之製造工序所致之製造成本的增加。如此一來，銅佈線層44即為感光性樹脂層21所包埋。此外，關於光刻導孔佈線44a及44c的結構將於後詳細說明。
重佈線層42係3層之銅佈線層44、46、48（金屬佈線層），但可使之為更多層之結構，亦可為單層、2層。銅佈線層44與深度相異之光刻導孔佈線44a和44c係在對底材蒸鍍鎳或銅之後藉由電鍍處理以銅來一體成形，並進一步以感光性樹脂覆蓋。於銅佈線層44之上層形成經圖案化之銅佈線層46，並進一步以感光性樹脂覆蓋。銅佈線層46中介光刻導孔佈線45而與銅佈線層44連接。於銅佈線層46之上層形成有經圖案化之銅佈線層48。銅佈線層48中介光刻導孔佈線47而與銅佈線層46連接。銅佈線層46與光刻導孔佈線45、銅佈線層48與光刻導孔佈線47分別在對底材蒸鍍鎳或銅之後藉由電鍍處理以銅來一體成形。銅佈線層46及48之上層分別進行疊合薄膜狀之感光性樹脂、加熱處理等，並以感光性樹脂填充光刻導孔佈線45及47的內側同時將整個表面平坦化。順帶一提，深度相異之光刻導孔佈線44a與44c，較上層之單純用於多層化佈線的光刻導孔佈線還更具有深度。在銅佈線層44的上層，亦進行疊合薄膜狀之感光性樹脂、加熱處理等，並以感光性樹脂填充光刻導孔佈線44a及44c的內側同時將整個表面平坦化。依製造過程、製品之運作時的溫度環境，會有因溫度之上下變動的影響而在具有數十μm之導孔直徑之光刻導孔佈線44a、44c的銅膜產生損傷的隱憂。因溫度之上下變動所致之作用於光刻導孔佈線44a與44c的熱應力的集中點為導孔底端與導孔的上部端，但本實施例中所使用之感光性樹脂（聚矽氧系或雙順丁烯二醯亞胺系的樹脂）由於相較其他絕緣樹脂（聚醯亞胺或環氧樹脂等），熱膨脹率CTE高但楊氏模數小（柔軟），故作用於光刻導孔佈線44a、44c之銅膜的限制力小，不會產生足以損傷銅膜的剪應力。雖然導孔長度愈深，施加於導孔底端的熱應力會變得愈高，但已可實證至180 μm～200 μm左右不會產生損傷。舉例而言，若為聚醯亞胺或環氧樹脂，則在熱膨脹低而楊氏模數高（堅硬）的情況下，由於作用於光刻導孔佈線之銅膜的限制力會變高，損傷銅膜的可能性會變高，因此可能需要實用上的檢驗。並且，亦確認到相較於感光性樹脂，由銅佈線本身所致之熱應力要來得更高，此熱應力的影響在導孔的上端部尤劇，但於在半導體封裝領域中之銅佈線，在180 μm～200 μm左右之導孔長度下，於導孔之上端部不會產生損傷。
再者，於感光性樹脂層21之與基底基板相反之側的面（上側面），形成有由防焊漆或其他絕緣膜所構成之絕緣層54。不存在絕緣層54的部分露出重佈線層42。自絕緣層54露出之重佈線層42的銅佈線層48，會作為外部連接端子49發揮功能。於多個外部連接端子49配置有多個焊球51。簡言之，重佈線層42亦可中介與外部連接端子49連接的多個焊球51來與外部基板等連接。
關於光刻導孔佈線44a及44c的結構，茲使用圖2以更詳細說明。光刻導孔佈線44a及44c的結構基本上相同。在圖2中，使用放大剖面圖，於左側詳細說明圖1之區域A所示之晶片33上的光刻導孔佈線44a的結構，並於右側詳細說明圖1之區域B所示之佈線層13上的光刻導孔佈線44c的結構。
如圖2所示，光刻導孔佈線44a及44c係「與晶片33之連接部或佈線層13之連接部連接的底部」與「側壁」連續的桶狀（杯狀），與配置於上部之佈線44b連續。在剖面視角中，光刻導孔佈線44a及44c包含：於底部與上部之間之中間部之處，側壁間之距離d大的部分，與於較中間部還要上部側之處，側壁間之距離da小的部分。亦即，光刻導孔佈線44a及44c，相對於中間部之孔面，上部的孔面狹小。於此所謂孔面，表示在與基板11大略平行之剖面中之光刻導孔佈線44a及44c的內側面。在圖2中，光刻導孔佈線44a及44c之側壁與配置於上部的佈線44b之間，係以朝向光刻導孔佈線44a或44c之內側連接成銳角。然而光刻導孔佈線44a及44c的側壁與佈線44b之間以透過平滑連續之彎曲面連接為佳。藉由光刻導孔佈線44a及44c在上部側之處的側壁間之距離da小於在中間部之處的側壁間之距離d，可抑制因溫度的上下變動所致之熱應力或衝擊、震動導致光刻導孔佈線44a及44c自導孔洞43及41掉出。亦即，可抑制「光刻導孔佈線44a與晶片33之連接部」及「光刻導孔佈線44c與佈線層13之連接部」剝離、脫落，可提升各個連接部的連接可靠性。再者，藉由光刻導孔佈線44a、44c的側壁與佈線44b之間透過平滑連續之彎曲面連接，可緩和施加於光刻導孔佈線44a、44c之側壁與佈線44b之連接部的應力集中。
光刻導孔佈線44a及44c更包含了於較中間部還要底部側之處側壁間之距離db小的部分，側壁與底部之間以平滑連續之彎曲面連接。藉由光刻導孔佈線44a及44c在底部側之處的側壁間之距離db小於在中間部之處的側壁間之距離d且側壁與底部之間平滑連接，可在形成於後所述之光刻導孔佈線44a及44c時抑制佈線不良，可提升光刻導孔佈線44a或44c與晶片33或佈線層13之連接部的連接可靠性。然而並不受限於此，光刻導孔佈線44a及44c的側壁與底部之間亦可朝向外側連接成銳角。亦即，光刻導孔佈線44a及44c亦可因鍍覆之應力而自導孔洞43及41的底部侵入至外側的感光性樹脂層21。藉由光刻導孔佈線44a及44c的底部侵入至感光性樹脂層21，可抑制因溫度的上下變動所致之熱應力或衝擊、震動導致光刻導孔佈線44a及44c自導孔洞43及41掉出，可提升光刻導孔佈線44a或44c與晶片33或佈線層13之連接部的連接可靠性。
佈線44b所連接之所有的光刻導孔佈線44a及44c係利用相同之曝光工序所形成，故雖有深度之不同，但結構基本上相同。配置於晶片33附近的光刻導孔佈線44a及44c，容易因晶片33與感光性樹脂層21之熱膨脹率的不同而受到熱應力的影響。並且，晶片33上的光刻導孔佈線44a尤其在衝擊或震動方面容易因其淺而掉出，在連接面積小之狭間距的晶片33會顯著出現。是故，藉由具有本實施型態相關之光刻導孔佈線44a及44c的結構，可提升光刻導孔佈線44a與晶片33之連接部或光刻導孔佈線44c與佈線層13之連接部的連接可靠性。
此光刻導孔佈線44a、44c、45、47位於不與晶片33之外周邊緣重疊的位置。
形成於感光性樹脂層21的多個導孔洞41及導孔洞43，係藉由對感光性樹脂選擇性照射光線並歷經顯影工序溶解去除樹脂而形成的光刻導孔。連接銅佈線層44、46、48之光刻導孔佈線45、47的導孔洞亦為光刻導孔。因「晶片33之接墊的形成面」與「基底基板內佈線層13的銅佈線層19」自感光性樹脂層21之上側面起的高度相異，故導孔洞43及導孔洞41之開口的深度相異。而且導孔洞43及導孔洞41的長寬比亦相異。導孔洞43的長寬比較導孔洞41的長寬比還要小。再者，導孔洞43的長寬比為1.5以下。如圖3所示，導孔洞的長寬比愈小，形成於導孔洞之光刻導孔佈線的不良率愈受到抑制。是故，藉由導孔洞43的長寬比為1.5以下，配置於導孔洞43之光刻導孔佈線44a的連接可靠性會提升。於此，所謂導孔洞43及導孔洞41的長寬比，定義為開口之高度除以底部開口端之最大直徑的值。光刻導孔佈線44a或光刻導孔佈線44c由於係極薄的銅膜（約2 μm～10 μm左右）內接於導孔洞43或導孔洞41，故此銅膜的厚度不會對光刻導孔佈線44a或光刻導孔佈線44c的長寬比造成影響。
以FOWLP之方式搭載之半導體晶片所具有的接墊之數量，壓倒性多於連接基底基板內佈線層13與重佈線層42的三維光刻導孔佈線之數量。簡言之，配置於晶片33之接墊之形成面上的導孔洞43之數量，較配置於基底基板內佈線層13上的導孔洞41之數量還要多。舉例而言，配置於晶片33之接墊形成面上的導孔洞43之數量為200個～10000個左右。另一方面，配置於基底基板內佈線層13上的導孔洞41，係成為由基底基板內佈線層13及重佈線層42而成之佈線之一部分者，其數量為20個～200個左右。是故，藉由使數量多的導孔洞43之長寬比為1.5以下，可提升各光刻導孔佈線44a的連接可靠性，可圖求整體之連接可靠性的提升。另一方面，數量少的導孔洞41之長寬比亦以1.5以下為符合期望，但由於只要使之配置多重的佈線路徑（routing path）即可維持整體之連接可靠性，故即使長寬比變得稍微大些仍可對應。藉由具有此種構造，可圖求半導體裝置40之可靠性的提升與佈線的高密度化。此外，如後所述，導孔洞43及導孔洞41係透過相同之工序來形成。
藉由如上之構造，晶片33之一部分的接墊中介重佈線層42而與焊球51電性連接，並且另一部分的接墊中介通過導孔洞41的銅佈線層44而與基底基板內佈線層13中的各銅佈線層電性三維連接。
其次，使用圖4及5說明由本發明之一實施例所帶來之半導體裝置的製造工序。
如同圖4所示，起初先準備在擁有剛性的基板11中介離型層12形成有佈線層13的基底基板。此基底基板與圖1中所示者相同。
於佈線層13上空著間隔牢牢接合晶片33。晶片33的厚度通常為100 μm以下，一般多為70 μm左右者。晶片33的積體電路形成面（接墊的形成面）相當於圖中上側面。
如圖5所示，在牢牢接合於佈線層13之上的晶片33上，形成有由感光性樹脂而成的感光性樹脂層21。感光性樹脂層21的厚度為200 μm以下，在疊合後較晶片33的厚度還要厚10 μm～50 μm。若將晶片33的厚度做成70 μm，則感光性樹脂層21為100 μm左右。感光性樹脂的材料並不特別限定，藉由將乾膜真空疊合加工來形成。首先，將薄膜狀之感光性樹脂疊合至晶片33上（在100℃下將薄膜狀之感光性樹脂初步接合至晶片33上之後真空吸引），利用簡易加壓將晶片33上隆起的部分予以平坦化（在60℃下花費5分鐘左右將之平坦化），將之初步熟化（在100℃下5分鐘左右）。絕緣性之感光性樹脂係由聚矽氧系或雙順丁烯二醯亞胺系之樹脂或柔軟的高分子材料所構成。感光性樹脂由於係以覆蓋晶片33的方式將之包埋，故彈性模數（Young’s Modulus）以在常溫下為1 GPa以下、在125℃下為0.1 GPa以下為符合期望。在感光性樹脂層21為聚矽氧系樹脂的情形中，藉由適當調整交聯密度或分子鏈的長度，可將彈性模數設定在上述範圍內。一般的環氧密封劑在常溫下為數十GPa，所以會使用彈性模數相當低的材料。作為感光性樹脂層21，只要滿足上述條件，亦可使用眾所周知的感光性樹脂材料。若彈性模數變成在常溫下為1 GPa以上或在125℃下為0.1 GPa以上，則晶片33的嵌埋會變得困難，容易產生空隙或脫層、嵌埋時的晶片毀傷等障礙。
藉由使用乾膜並透過真空疊合加工來形成，感光性樹脂層21可大略平坦形成上側面（與基板11相反之側的面）。然而，感光性樹脂層21的上側面（與基板11相反之側的面）有時會在配置晶片33的位置稍微隆起，感光性樹脂層21的上側面有時會沿著晶片33的外周邊緣產生微小的高低差。在平坦化工序中，此微小的高低差即便產生亦可將之控制在數微米以下（佈線寬度以下）。於此雖說明了利用疊合的製造方法，但亦可考慮利用模具之封膠或利用狹縫塗布（slit coating）等之密封。
感光性樹脂層21會於與晶片33之外周邊緣重疊的區域產生微小的高低差。以橫跨此高低差之方式於上方形成的重佈線，會受到高低差之高度的影響，若將佈線寬度做細，斷線的可能性會變高。為了抑制斷線的可能性，在可靠性上，佈線寬度以寬者為佳，高低差以控制在低者為佳。
其次，如圖6所示，首先，於經平坦化之感光性樹脂層21形成將係為晶片33之一部分之接墊露出的導孔洞43，與將基底基板內佈線層13之銅佈線層19之連接部露出的導孔洞41。導孔洞43與導孔洞41的形成方法相同。在圖7及圖8中，使用放大剖面圖，於左側詳細說明圖6之區域A所繪示之晶片33上的導孔洞43之製造方法，並於右側詳細說明圖6之區域B所繪示之銅佈線層19上的導孔洞41之製造方法。
將經平坦化之感光性樹脂層21初步加熱至不會完全固化（初步固化）的程度，之後，如圖7所示，自固定於基底基板內之佈線層13之上之晶片33的感光性樹脂層21側（與基板11相反之側），向感光性樹脂層21選擇性照射紫外線52而曝光。紫外線52係透過金屬鹵素燈或高壓水銀燈產生，中介配置於感光性樹脂層21上之模板遮罩（stencil mask）56的開口部來選擇性照射紫外線52。位於模板遮罩56之開口部之下的感光性樹脂層21被紫外線52曝光。於此，感光性樹脂層21之上側面與模板遮罩56之間的距離，舉例而言，若為對準儀則可為0 μm以上且未達10 μm，若為步進機則可為10 cm以上且未達20 cm。
在本實施型態中，感光性樹脂在曝光量800 mJ/cm2 以上且2000 mJ/cm2 以下感光。較佳為感光性樹脂在曝光量800 mJ/cm2 以上且1600 mJ/cm2 以下感光。藉由以上述範圍內之曝光量利用1片遮罩一舉曝光，可一舉形成深度相異之導孔洞41及導孔洞43。易言之，在本實施型態中感光性樹脂係以可形成導孔洞41之程度──亦即，對形成導孔洞43而言為過度──的曝光量來感光。感光性樹脂以350 nm以上之波長的光線穿透率為85%以上為符合期望。於此，所謂感光性樹脂的光線穿透率，係將15 μm厚的樹脂於玻璃基板上成膜、固化，並自在各波長之光線的吸收／穿透量算出穿透率。在感光性樹脂為聚矽氧系樹脂的情況下，藉由適當調整交聯密度或分子鏈之長度等，可將光線穿透率設定在上述範圍內。藉由將感光性樹脂層21之感光性樹脂的曝光量及光線穿透率設定在上述範圍內，可一舉形成於後所述之形狀的導孔洞41及導孔洞43。
藉由感光性樹脂層21的曝光量為800 mJ/cm2 以上，紫外線52之一部分會繞進模板遮罩56之下的感光性樹脂層上部21a，而亦額外照射至由模板遮罩56遮蔽之區域之外緣附近的感光性樹脂層上部21a。亦即，位於被模板遮罩56遮蔽之區域下的感光性樹脂層上部21a之一部分亦受紫外線52額外曝光。透過此種曝光方法，於後所述之導孔洞43及41可形成包含「於底部與上部之間之中間部之處的側壁間之距離D（孔面的距離）大的部分」與「於較中間部還要上部側之處側壁間之距離Da小的部分」的桶狀。
並且，藉由感光性樹脂層21的曝光量為2000 mJ/cm2 以下，可抑制被模板遮罩56遮蔽之區域之外緣附近的感光性樹脂層上部21a過於過度曝光。透過此種曝光方法，於後所述之導孔洞43及41的開口上部會以平滑連續之彎曲面連接，而可緩和施加在「於後所述之光刻導孔佈線44a側壁」與「佈線44b」之連接部的應力集中。依所選擇之樹脂，導孔洞43一旦達過度曝光2000 mJ/cm2 以上，亦有可能形成較模板遮罩56之導孔尺寸直徑收縮一半以上之形狀，尺寸控制會變難，並且發生可靠性之問題的危險度上升。導孔洞43及導孔洞41以上部側之側壁間的距離Da形成為模板遮罩56之導孔尺寸直徑的50%以上為佳。為了此種尺寸控制，感光性樹脂層21的曝光量以1600 mJ/cm2 以下為較佳。透過此種曝光方法，可抑制被模板遮罩56遮蔽之區域之外緣附近的感光性樹脂層上部21a過於過度曝光，可控制於後所述之導孔洞43及41的形狀與大小。
另一方面，紫外線52之一部分藉由在晶片33及佈線層13之銅佈線層（例如銅佈線層19）的上側面反射，繞進模板遮罩56之下的感光性樹脂層下部21b，而亦額外照射由模板遮罩56遮蔽之區域之外緣附近的感光性樹脂層下部21b。亦即，位於被模板遮罩56遮蔽之區域下的感光性樹脂層下部21b之一部分亦會受紫外線52額外曝光。透過此種曝光方法，於後所述之導孔洞43及41亦可包含「於較中間部還要底部側之處側壁間之距離Db小的部分」，側壁與底部之間亦可以平滑連續之彎曲面連接。
圖9於左側說明圖6之區域A所繪示之晶片33上的導孔洞43之尺寸與曝光量的關係，並於右側說明圖6之區域B所繪示之銅佈線層19上的導孔洞41之尺寸與曝光量的關係。於圖9的左側，將模板遮罩56之導孔尺寸直徑設定為60 μm，並以黑色圓點來標示在各曝光量下形成之導孔洞43之上部側的側壁間之距離Da。導孔洞43可以400 mJ/cm2 以上來形成，若以1600 mJ/cm2 來曝光，則上部側的側壁間之距離Da為34 μm。若將Da形成為遮罩尺寸的50%以下，則就可靠性、製造管理問題的觀點而言，在1600 mJ/cm2 以上危險度會增加。於圖9的右側，將模板遮罩56的導孔尺寸直徑設定為100 μm，並以黑色方形來標示在各曝光量下形成之導孔洞41之上部側的側壁間之距離Da。導孔洞41可以800 mJ/cm2 以上來形成，若以1600 mJ/cm2 來曝光，則上部側的側壁間之距離Da為80 μm。Da形成為遮罩尺寸的80%。由此等結果可知，在本實施型態之350 nm以上之波長的光線穿透率為85%以上的感光性樹脂中，用以將導孔洞43及導孔洞41一舉曝光的曝光量以800 mJ/cm2 以上且1600 mJ/cm2 以下之範圍為佳。
如圖8所示，在曝光後施以熱加工，透過顯影處理來溶解去除（顯影）未經選擇照射的感光性樹脂。潤洗後，透過加熱處理進行正式固化，藉此可形成感光性樹脂層21的導孔洞43及41。藉由此種導孔洞43及41的製造方法，在剖面視角下的導孔洞43及41，可形成為包含「於底部與上部之間之中間部之處的側壁間之距離D大的部分」與「於較中間部還要上部側之處的側壁間之距離Da小的部分」的桶狀。在圖8中，導孔洞43及41的開口上部朝向內側突出成銳角。再者，在剖面視角視角下的導孔洞43及41亦可包含「於較中間部還要底部側之處的側壁間之距離Db小的部分」，側壁與底部之間亦可以平滑連續之彎曲面連接。然而並不受限於此，透過紫外線52的波長、曝光量、來自感光性樹脂層21之下層的反射率、感光性樹脂層21的感光特性材料及顯影條件等，可控制導孔洞43及41之在中間部之處的側壁間之距離D與在上部側之處的側壁間之距離Da的差、導孔洞43及41之在中間部之處的側壁間之距離D與在下部側之處的側壁間之距離Db的差、導孔洞43及41之開口上部及底部的形狀。
導孔洞43及41藉由側壁與底部之間以平滑連續之彎曲面連接，利用灰化處理之殘留於感光性樹脂層21之導孔洞43及41的殘渣、殘膜的去除效率會提升。殘渣、殘膜會成為於後所述之成為鍍銅之晶種的鈦（Ti）／銅（Cu）堆疊薄膜變得不連續的原因，並且，即使鈦（Ti）／銅（Cu）堆疊薄膜在殘渣、殘膜上連續成膜，亦會影響後續之鍍銅的成長。亦即，藉由殘渣、殘膜的去除效率提升，可提升光刻導孔佈線44a與晶片33之連接部以及光刻導孔佈線44c與佈線層13之連接部的連接可靠性。於此，所謂殘渣、殘膜並不受限於感光性樹脂層21，舉例而言，亦包含用於佈線區域之圖案化的感光性光阻。再者，導孔洞43及41藉由側壁與底部之間以平滑連續之彎曲面連接，於後所述之成為鍍銅之晶種的鈦（Ti）／（Cu）堆疊薄膜之利用濺鍍的成膜之效率（包繞）會提升，可進一步提升光刻導孔佈線44a與晶片33之連接部以及光刻導孔佈線44c與佈線層13之連接部的連接可靠性。
配置於「感光性樹脂層21之與基板11大略平行之同一面」上的所有導孔洞43及41由於係利用相同之曝光工序來形成，故雖有深度之不同，但結構基本上相同。由於配置於晶片33之外側的導孔洞41深（感光性樹脂層21厚），故特別容易受到殘渣、殘膜之去除效率的影響。並且，由於導孔洞41深，故容易受到於後所述之成為鍍銅之晶種的鈦（Ti）／銅（Cu）堆疊薄膜之利用濺鍍的成膜之效率（包繞）的影響。藉由具有本實施型態相關之導孔洞41的結構，由於殘渣、殘膜不易殘留且利用濺鍍的成膜容易進行，故可進一步提升光刻導孔佈線44c與佈線層13之連接部的連接可靠性。
此外，已完全固化的感光性樹脂層21相較於半導體晶片的環氧樹脂材等封膠樹脂，其表示硬度的楊氏模數要低約一個數量級，但只要不給予衝擊，所形成之導孔洞41及43的形狀即不會改變。此時，同時在應用處理器晶片33之接墊上形成導孔洞43並在佈線層13之連接部上形成導孔洞41的開口。
基底基板內佈線層13及晶片33之接墊的形成面之自感光性樹脂層21之上側面起的高度相異。是故，導孔洞43及導孔洞41的長寬比亦相異。導孔洞43的長寬比較導孔洞41的長寬比還要小。再者，長寬比以1.5以下為佳。在晶片33為約70 μm之厚、感光性樹脂層21為約100 μm之厚，而導孔洞43的直徑為30 μm、導孔洞41的直徑為70 μm的情況下，導孔洞43的長寬比為1.0，導孔洞41的長寬比為1.42。
如圖10所示，銅佈線層44係透過鍍銅方法形成。在本實施型態中銅佈線層44，由於導孔洞41深，故係藉由電鍍處理形成。首先，將作為鍍銅之晶種的鈦（Ti）／銅（Cu）堆疊薄膜藉由濺鍍形成於整個面。於此面之上塗布感光性光阻並以露出佈線區域的方式圖案化。接下來，將由感光性光阻露出之鈦（Ti）／銅（Cu）堆疊薄膜的部分作為晶種施以鍍銅（Cu）之後，剝離感光性光阻，蝕刻去除銅佈線圖案以外的晶種層，藉此形成銅佈線層44。藉由此工序，導孔洞41及43的內側面亦鍍銅，形成光刻導孔佈線44c及44a。簡言之，可一體成形配置於感光性樹脂層21之上側面的佈線44b與光刻導孔佈線44c及44a。
透過電鍍處理一體成形之光刻導孔佈線44a、佈線44b及光刻導孔佈線44c的特徵在於：底材的金屬係藉由濺鍍來形成，相較於無電鍍等，擁有緻密的層體。無電鍍擁有多孔之結構，與感光性樹脂21的密合性差，發生可靠性問題的可能性高。並且，於底材上透過電鍍處理而形成之光刻導孔佈線44a、佈線44b及光刻導孔佈線44c，可在感光性樹脂層21上以大略均勻且穩定的厚度來形成密合性高的堆疊結構，所述厚度反映了感光性樹脂層21上側面之結構。
光刻導孔佈線44c及44a的形成方法相同。在圖11中，使用放大剖面圖，於左側說明圖10之區域A所繪示之晶片33上的光刻導孔佈線44a及佈線44b的製造方法，並於右側說明圖10之區域B所繪示之佈線層13上的光刻導孔佈線44c及佈線44b的製造方法。形成於導孔洞43之內側面及底面的光刻導孔佈線44a，反映了導孔洞43的形狀。形成於導孔洞41之內側面及底面的光刻導孔佈線44c，反映了導孔洞41的形狀。藉由光刻導孔佈線44a及44c具有此種結構，可抑制光刻導孔佈線44a及44c因由溫度的上下變動所致之熱應力或衝擊、震動而自導孔洞43及41掉出，可提升光刻導孔佈線44a與晶片33之連接部以及光刻導孔佈線44c與佈線層13之連接部的連接可靠性。
於圖12繪示本實施型態相關之光刻導孔佈線44a及光刻導孔佈線44c的剖面照片。可確認到光刻導孔佈線44a（圖12左）及光刻導孔佈線44c（圖12右）皆為在上部側之處的側壁間之距離da小於在中間部之處的側壁間之距離d，在底部側之處的側壁間之距離db小於在中間部之處的側壁間之距離d。再者，在光刻導孔佈線44c（圖12右），可確認到光刻導孔佈線44c已自導孔洞41底部侵入至外側之感光性樹脂層21。
如圖13所示，於銅佈線層44之上形成由感光性樹脂而成的感光性樹脂層21。具體而言，係使用15 μm左右之膜厚的薄膜狀之感光性樹脂材（乾膜），藉由真空疊合來形成。藉此，光刻導孔佈線44a及44c的內側會填充感光性樹脂，露出的上側面亦變得平坦。配置於此銅佈線層44之上的感光性樹脂使用與包埋應用處理器晶片33的感光性樹脂相同的材料系統。此外，由於最終的厚度為5 μm左右之膜厚，故亦能夠旋轉塗布或狹縫塗布與運用在本實施型態之感光性樹脂材不同種類的液體狀之感光性樹脂材。
如圖14所示，歷經初步固化、曝光、顯影、正式固化之處理，於銅佈線層44之上的感光性樹脂層21形成用於光刻導孔佈線45的導孔洞。透過之後的銅金屬化處理，形成光刻導孔佈線45。如圖15所示，銅佈線層46亦透過重覆與銅佈線層44相同之工序來形成。
如圖16所示，於銅佈線層46之上進一步形成由感光性樹脂而成之感光性樹脂層21。具體而言，係使用5 μm至10 μm左右之膜厚的薄膜狀之感光性樹脂材（乾膜），藉由真空疊合來形成。藉此，光刻導孔佈線45的內側會填充感光性樹脂，露出的上側面亦變得平坦。配置於此銅佈線層46之上的感光性樹脂亦以使用與包埋應用處理器晶片33之感光性樹脂相同的材料系統為佳。此外，由於最終的厚度為5 μm至10 μm左右之膜厚，故亦能夠旋轉塗布或狹縫塗布與運用在本實施型態之感光性樹脂材不同種類的液體狀之感光性樹脂材。重佈線層42的光刻導孔佈線47及銅佈線層48亦透過重覆相同之工序來形成。藉由使用相同的感光性樹脂，各層透過無邊界層之結合來達成多層化，感光性樹脂層21會一體化。此外，即使係不同種類的液狀之感光性樹脂系統，由於各層體薄，故儘管結合稍微減弱，仍能達成可確保指定之品質的層間結合。
如此一來，便能在低價的製程下使用深度相異之光刻導孔佈線44a、44c來將晶片33與基底基板內佈線層13連接至重佈線層42。
本發明之其他實施型態相關之半導體裝置40A’的剖面圖繪示於圖17。在此實施例中，係2種大小的應用處理器晶片33a與33b相異之半導體晶片以Face-Up的方式中介接合劑34a與34b而牢牢接合於佈線層13者。製造工序雖與前述實施例相同，但由於晶片33a與33b的晶片厚度相異，故露出晶片33a與33b之接墊的導孔洞43a與44b的深度相異，配置於此等導孔洞43a與44b之內側面及底面上的光刻導孔佈線44aa與44ab的深度亦相異。銅佈線層44包含：配置於導孔洞43a及43b之內側面及底面上的光刻導孔佈線44aa（第1光刻導孔佈線）及44ab（第3光刻導孔佈線），與配置成與晶片33a及33b之接墊之形成面大略平行的佈線44b。佈線44b大略平行配置於「感光性樹脂層21之基底基板側的面（下側面）」與「和基底基板相反之側的面（上側面）」之間。在本實施形態中，「配置於導孔洞43a及43b之內側面及底面上的光刻導孔佈線44aa及44ab」與「佈線44b」係一體成形，雖未圖示但在縱深方向上電性連接。藉由具有此種構造，晶片33a及33b中介重佈線層42內的銅佈線層44而電性連接。
此外，由於導孔洞43a及43b的深度相異，故導孔洞43a及43b的長寬比亦相異，長寬比以1.5以下為符合期望。藉由導孔洞43a及導孔洞43b的長寬比為1.5以下，配置於導孔洞43a之光刻導孔佈線44aa及44ab的連接可靠性會提升。光刻導孔佈線44aa或44ab由於內接於導孔洞43a或43b，故光刻導孔佈線44aa或44ab的長寬比與導孔洞43a或43b的長寬比大略相同。導孔洞43a及43b可透過相同之工序來形成。若晶片33a的厚度做成70 μm，晶片33b的厚度做成50 μm，感光性樹脂層21的厚度做成100 μm，而與晶片33a之接墊之形成面重疊的區域之膜厚做成30 μm，與晶片33b之接墊之形成面重疊的區域之膜厚做成50 μm，則在導孔洞43a的直徑為30 μm、導孔洞43b的直徑做成40 μm的情形中，導孔洞43a的長寬比為1.0，導孔洞43b的長寬比為1.25。
本發明之其他實施型態相關之半導體裝置40B’的剖面圖繪示於圖18。在此實施例中，2個記憶體晶片33x、33y與儲存控制器晶片33z以各自之接墊不重疊的方式（露出的方式）堆疊成階梯狀，並確實為感光性樹脂層21所包住。感光性樹脂層21的厚度為200 μm以下，較晶片33x、33y、33z的總厚度還要厚10 μm～50 μm。最上層之晶片（在此情況下為晶片33z）之與具有接墊的晶片面重疊的區域之厚度以5 μm以上且50 μm以下為佳。藉由此種堆疊結構，形成於各晶片33x、33y、33z之接墊之上的光刻導孔佈線的深度相異。並且此等光刻導孔佈線的長寬比以1.5以下為符合期望。
此外，本發明並非受上述實施型態及變形例所限制者，能夠在不脫離要旨的範圍適當變更。並且，各實施型態及變形例能夠適當組合。
11:基板 12:離型層 13:佈線層 14:絕緣膜 15、17、19、44、46、48:銅佈線層 16、107:防焊漆或絕緣層 18、18’:導孔 21:感光性樹脂層 21a:感光性樹脂層上部 21b:感光性樹脂層下部 33、33a、33b:半導體元件（應用處理器晶片） 33x、33y:記憶體晶片 33z:儲存控制器晶片 34:接合層 34a、34b:接合劑 40、40A’、40B’:半導體裝置 41、43、43a、43b:導孔洞 42:重佈線層 44、46、48:銅佈線層 44a、44c、44aa、44ab、45、47:光刻導孔佈線 44b:佈線 49:外部連接端子 51、61:焊球 52:紫外線 54:絕緣層 56:模板遮罩
〈圖1〉係本發明之一實施型態相關之半導體裝置的剖面圖。
〈圖2〉係本發明之一實施型態相關之半導體裝置的放大剖面圖。
〈圖3〉係繪示本發明之一實施型態相關之半導體裝置之可靠性的圖。
〈圖4〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖5〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖6〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖7〉本發明之一實施型態相關之半導體裝置之製造方法的放大剖面圖。
〈圖8〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的放大剖面圖。
〈圖9〉係繪示本發明之一實施型態相關之半導體裝置之曝光量與導孔洞之尺寸之關係的圖。
〈圖10〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖11〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的放大剖面圖。
〈圖12〉本發明之一實施型態相關之半導體裝置的剖面照片。
〈圖13〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖14〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖15〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖16〉係繪示本發明之一實施型態相關之半導體裝置之製造方法的剖面圖。
〈圖17〉係本發明之變形例相關之半導體裝置的剖面圖。
〈圖18〉係本發明之變形例相關之半導體裝置的剖面圖。
19:銅佈線層
21:感光性樹脂層
33:半導體元件(應用處理器晶片)
44a、44c:光刻導孔佈線
44b:佈線

Claims (9)

  1. 一種電子電路裝置，其特徵為具備：至少一個電子電路元件；與由絕緣性之感光性樹脂層而成的重佈線層，所述絕緣性之感光性樹脂層一併包有前述電子電路元件之連接部的形成面及側面，並且具有「與前述電子電路元件之前述連接部電性連接之深度相異之多個光刻導孔佈線」及「在與前述電子電路元件之前述連接部的形成面平行的同一面上電性連接各個前述光刻導孔佈線的佈線」，各個前述光刻導孔佈線係「與前述電子電路元件之前述連接部連接的底部」與「側壁」連續的桶狀，相對於前述底部與相反側之上部之間的中間部之孔面，前述上部的孔面狹小。
  2. 一種電子電路裝置，其特徵為在如請求項1所述之電子電路裝置中，前述光刻導孔佈線之前述側壁與前述底部之間係以平滑連續之彎曲面連接。
  3. 一種電子電路裝置，其特徵為在如請求項1或2所述之電子電路裝置中，前述光刻導孔佈線的內側填充有前述感光性樹脂層。
  4. 一種電子電路裝置，其特徵為在如請求項1至3之任1項所述之電子電路裝置中，前述光刻導孔佈線的長寬比為1.5以下。
  5. 一種電子電路裝置，其特徵為如請求項1至4之任1項所述之電子電路裝置更具備包含「具有連接部之佈線層」的基底基板，前述重佈線層具備：與前述電子電路元件之前述連接部直接連接的第1光刻導孔佈線，以及設置於前述電子電路元件之外周並在與連接前述佈線之一端為相反之側的另一端上與前述佈線層之前述連接部直接連接的第2光刻導孔佈線。
  6. 一種電子電路裝置，其特徵為如請求項5所述之電子電路裝置以於與前述基底基板側之面對向的面露出連接部的方式將元件厚度相異之多個前述電子電路元件併設固定，前述重佈線層具備分別與各個前述電子電路元件之連接部電性直接連接之深度相異的多個前述光刻導孔佈線。
  7. 一種電子電路裝置，其特徵為如請求項1至5之任1項所述之電子電路裝置以將多個前述電子電路元件之連接部露出的方式堆疊固定成階梯狀，前述重佈線層具備分別與各個前述電子電路元件之連接部電性直接連接之深度相異的多個前述光刻導孔佈線。
  8. 一種電子電路裝置的製造方法，其特徵為：將至少包有前述至少1個電子電路元件之連接部的形成面及側面並且包覆前述連接部之形成面的上側面平坦化，以形成感光性樹脂層，藉由將前述感光性樹脂層選擇性曝光或顯影，形成使前述電子電路元件之連接部露出之深度相異的多個導孔洞，於前述多個導孔洞形成「與前述電子電路元件之前述連接部電性連接之深度相異的多個光刻導孔佈線」及「在與前述電子電路元件之前述連接部的形成面平行的同一面上電性連接各個前述光刻導孔佈線的佈線」，各個前述光刻導孔佈線係藉由控制由前述選擇性曝光所致之指定範圍的曝光量，形成「與前述電子電路元件之前述連接部連接的底部」與「側壁」連續的桶狀，並且係以「相對於前述底部與相反側之上部之間的中間部之孔面，前述上部的孔面狹小」的方式來形成。
  9. 一種電子電路裝置的製造方法，其特徵為在如請求項8所述之電子電路裝置的製造方法中，前述光刻導孔佈線之前述側壁與前述底部之間形成為平滑連續之彎曲面。
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