000189067 001__ 189067
000189067 005__ 20181203023244.0
000189067 0247_ $$2doi$$a10.1021/jp4030188
000189067 022__ $$a1932-7447
000189067 02470 $$2ISI$$a000319896700013
000189067 037__ $$aARTICLE
000189067 245__ $$aDetermining the Conductivities of the Two Charge Transport Phases in Solid-State Dye-Sensitized Solar Cells by Impedance Spectroscopy
000189067 260__ $$bAmerican Chemical Society$$c2013$$aWashington
000189067 269__ $$a2013
000189067 300__ $$a10
000189067 336__ $$aJournal Articles
000189067 520__ $$aTo apply impedance spectroscopy (IS) for studying charge transport in the mesoporous film of solid-state dye-sensitized solar cells (ss-DSCs), it is necessary to determine the relative conductivities of the electron and hole transporting phases, given the equivalent positions of the distributed electron and hole transport resistances (r(t) and r(h)) in the equivalent circuit. Here, in-plane transistor-like devices employing dye-sensitized TiO2 and the spiro-OMeTAD hole conductor were fabricated and characterized with IS. By design, r(t) and r(h) are no longer in equivalent positions in these devices, thus providing a means to determine their values independently. Fitting and simulation results of transistor-like devices combined with cross checks against results obtained for ss-DSCs with regular solar cell geometry clearly show that r(t) is significantly larger than r(h) under all conditions studied. With r(t) and r(h) confidently assigned, charge transport and transfer in ss-DSCs are discussed and effective carrier diffusion lengths are calculated. The results show that charge collection is limited by an inadequate electron diffusion length in ss-DSCs, implying the necessity to enhance electron transport or retard recombination in order to improve the performance of ss-DSCs. We expect that the experimental methodology proposed here will find important use in other ss-DSCs.
000189067 700__ $$uNatl Univ Singapore, NUSNNI NanoCore, Fac Engn, Dept Mat Sci & Engn, Singapore 117576, Singapore$$aLi, Feng
000189067 700__ $$uNatl Univ Singapore, NUSNNI NanoCore, Fac Engn, Dept Mat Sci & Engn, Singapore 117576, Singapore$$aJennings, James Robert
000189067 700__ $$0240504$$g156739$$uNatl Univ Singapore, NUSNNI NanoCore, Fac Engn, Dept Mat Sci & Engn, Singapore 117576, Singapore$$aWang, Qing
000189067 700__ $$uNanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore$$aChua, Julianto
000189067 700__ $$uNanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore$$aMathews, Nripan
000189067 700__ $$uNanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore$$aMhaisalkar, Subodh G.
000189067 700__ $$0242522$$g175708$$aMoon, Soo-Jin
000189067 700__ $$g106763$$aZakeeruddin, Shaik M.$$0240194
000189067 700__ $$aGraetzel, Michael$$g105292$$0240191
000189067 773__ $$j117$$tJournal Of Physical Chemistry C$$k21$$q10980-10989
000189067 909C0 $$xU10101$$0252060$$pLPI
000189067 909CO $$pSB$$particle$$ooai:infoscience.tind.io:189067
000189067 917Z8 $$x105528
000189067 937__ $$aEPFL-ARTICLE-189067
000189067 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000189067 980__ $$aARTICLE