ࡱ> 574 Rbjbj*8u&SSS%%%%%%%,)C,&SSSSS&T/&S^%S%`$h0%ڦ֊^$%E&0u&$X,, 0%0%D%SSS&&SSSu&,SSSSSSSSS Q:   Electronic Structures of Organic Molecules and Polymers Studied by High Sensitivity Photoemission Measurements Hisao Ishii Center for Frontier Science, Chiba University, Chiba-shi 263-8522, Japan *E-mail : ishii130@faculty.chiba-u.jp Information on occupied electronic states such as HOMO of organic functional materials is indispensable to understand and improve organic electronic devices. Usually the ionization energy is used to characterize the nature of valence top region of materials, but it is not enough. The distribution of the density of states (DOS) is also necessary to understand the electronic properties. Moreover, very weak DOS in band gap region, called gap state, is also important factor to discuss the practical electric properties; it works as trap, and modify the intrinsic and quasi Fermi level of organic semiconductors. To directly examine such weak DOS, we have developed apparatus for high sensitivity UV photoemission spectroscopy (HS-UPS) and high sensitivity photoelectron yield spectroscopy (HS-PYS)[1,2]. By using these techniques, weak DOS of organic materials can be detected. This high sensitivity also enables to detect low-density species in organic semiconductors. In the first part of my talk, the observed gap state of organic materials will be reported in relation to the electric properties. In the second part, negative ion photoemission spectroscopy for polarized organic films will be reported as a new tool to access unoccupied state of organic materials. References [1] S. Machida et al., Applied Physics Express, 6(2) (2013) 025801-1. [2] Y. Nakayama et al., Advanced Energy Materials, 4(7) (2014) 1301354-1.     7nop{} U 'Bqùsg_WOW_D_DhB4h)DCJaJhRCJaJh{tCJaJh)DCJaJh|cOJQJmHsHh|cCJOJQJmHsHh)Dh)DOJmH sH h|cOJQJmHsHh)DOJQJh)Dh)DOJQJh)Dh)DOJQJ]h|cCJOJQJh)Dh)DCJOJQJh&h|cCJOJQJh|cCJKHOJQJhmhmCJOJQJh{tCJOJQJop|} ss`UU WD`gd{t @`  @ $ @`  @Xd`Xa$gdc =$ @`  @da$gdc =$ @`  @da$gdc =$ @`  @da$ @`  @d1$gd{t = @`  @ $1$a$gd)Dgd)D @`  @gdc =qrɷh|c#h|cB*PJ_HmHnHphtHh*CJaJ(|. A!"#$%     12 0@P`p2( 0@P`p 0@P`p 0@P`p 0@P`p 0@P`p 0@P`p8XV~8XV~PJ_HmH nHsH tH8`8 jnCJ_HaJmH sH tH $A $ k=0000TiT jnn0h.a44l44l $k $000j0W0 HoH  !B*PJ_HmHnHphsHtHZoZ \1 $1$a$-B*KHOJPJQJ_HmH nHphsH tH`o` | ()1 dd-B*CJOJPJQJ_HmH nHphsH tH2"2 0000 B#G$6o16  0000 (eW[) CJaJtH 2 B2 0000 B#G$6oQ6  0000 (eW[) CJaJtH R^@bR *>0jn (Web)dd[$\$OJPJQJ^JnHtHPK!pO[Content_Types].xmlj0Eжr(΢]yl#!MB;.n̨̽\A1&ҫ QWKvUbOX#&1`RT9<l#$>r `С-;c=1gN3PT9bt6"IORGT&'*hҸ Ԑ'a^>{⍏E6Je|ߞ|n(ß~ 晘ǿ<}~Q  >X ؖ?D7B, Jš%# }k(r؎]^޷ D|(C(;(Ps&|X!t+a I\*ܥ(h,=c!V\wH`}#^gHgUDhĐ@ȷ^Q[FBWh]S+PإbZM$#ʸkXm~_9ӾCGtD[l8ua;$w>(vtw!򀒙KX&M DrG!^̪ΈTn1uLٴ݄wGf#n_>tRvizfQ&!yy ] 1D!7yV?_<%OXZqfMwo FSu2L`i3Q'B)l+R2R&ਨ4W0@rfxY 'BjDJ-_ɔo2YE5lm&Ekeb}$`Mx(‰_M DqnrEgIQq$B!6)KѬ%4rYD v,fϜAL &ޢwXk+K+ ?&6=uN<3j Ddr_eؿRUv18d>+נD5+ vjqYNviD)lO%7ڹ:\)r2.GꔺϸPap{dqˉ8ƻ@KPVɖftE10*\U{f4tYjR7Ɋ?q1 NK_Xk|,;^LvIռ+ůV˦zEYKka)Vr `I SGx@vp_L   q   ` C 7""7""@H 0(  0( ~/ B S  ?;>::(2+!fR(2f,p_N@D}aklg ^`OJ QJ o( 8^8`OJQJo(^`OJ QJ ^J o(o  p^ `OJ QJ o(  @ ^ `OJ QJ o( x^x`OJQJo(H^H`OJ QJ ^J o(o ^`OJ QJ o( ^`OJ QJ o(^`CJOJQJo(^`CJOJ QJ o(opp^p`CJOJ QJ o(@ @ ^@ `CJOJ QJ o(^`CJOJ QJ o(^`CJOJ QJ o(^`CJOJ QJ o(^`CJOJ QJ o(PP^P`CJOJ QJ o( W^`Wo(hH) ^`o(hH) ^`o(hH.. <^`)h> t@\y`@Unknown G*Ax Times New Roman5Symbol3 *Cx ArialQ*Ax Times New Roman BoldU> | ѹ@ Arial Unicode MSCN z 0000҉0 Pro W3C  PLucida GrandeI ??Arial Unicode MS-O|i0t;Wingdings?*Cx Courier NewA$BCambria Math#Ah3S5FS5%[4DDDD2 #q(2! xx *Preparation of your abstract for 16th ME&DBESTUSER Ishii Hisao       Oh+'0  , P \ h t,Preparation of your abstract for 16th ME&D BESTUSER Normal.dotm Ishii Hisao4Microsoft Macintosh Word@q@֎t@j7Ԋ@֊DD ՜.+,0 hp|   +Preparation of your abstract for 16th ME&D  タイトル  !"#%&'()*+-./01236Root Entry Fe֊81Table -WordDocument*SummaryInformation($DocumentSummaryInformation8,CompObj^ FMicrosoft Word 97 - 2004 NB6WWord.Document.8