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Kim, Min-Hye,Suh, Myungkoo,Gowrishankar, Vignesh,McGehee, Michael D,Kwon, Young-Uk American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.1
<P>We studied the properties of regioregular P3HT conducting polymers with three different molecular weights infiltrated into the pores of mesoporous titania thin films. The titania thin films, prepared by self-organization of titania species with a non-ionic triblock copolymer F127 followed by calcination to remove organics, have arrays of 7 nm vertical nanochannels. The UV-Vis spectra of the P3HT-titania nanocomposite films revealed that the interstrand interactions between P3HT chains were weakened by the infiltration. Such an effect increases as the molecular weight of P3HT increases and as the infiltration temperature increases. Consequently, the efficiency of the solar cells, assembled by using the P3HT infiltrated mesoporous titania thin films, was the highest with the smallest P3HT, contrary to the generally accepted practice of using high molecular weight P3HT for forming bulk heterojunction solar cells.</P>
Jiang, Ying,Hong, Sanghyun,Oh, Joon Hak,Mondal, Rajib,Okamoto, Toshihiro,Verploegen, Eric,Toney, Michael F.,McGehee, Michael D.,Bao, Zhenan The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.10
<P>Regioregular pentacene-containing polymers were synthesized with alkylated bithiophene (<B>BT</B>) and cyclopentadithiophene (<B>CPDT</B>) as comonomers. Among them, 2,9-conjugated polymers <B>PnBT-2,9</B> and <B>PnCPDT-2,9</B> achieved the best performance in transistor and photovoltaic devices respectively. The former achieved the most highly ordered structures in thin films, yielding ambipolar transistor behavior with hole and electron mobilities up to 0.03 and 0.02 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> on octadecylsilane-treated substrates. The latter achieved photovoltaic power conversion efficiencies up to 0.33%. The impact of regioregularity and direction of conjugation-extension (2,9 <I>vs.</I> 2,10), on thin-film order and device performance has been demonstrated for the pentacene-containing polymers for the first time, providing insight towards future functional material design.</P> <P>Graphic Abstract</P><P>Regioregular pentacene-bithiophene-based polymers exhibit disparate solid-state packing and field-effect transistor performance, with the 2,9-conjugation-extended polymer showing the highest molecular order and hole mobility. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm15483h'> </P>
Challenges for commercializing perovskite solar cells
Rong, Yaoguang,Hu, Yue,Mei, Anyi,Tan, Hairen,Saidaminov, Makhsud I.,Seok, Sang Il,McGehee, Michael D.,Sargent, Edward H.,Han, Hongwei American Association for the Advancement of Scienc 2018 Science Vol.361 No.6408
<P>Perovskite solar cells (PSCs) have witnessed rapidly rising power conversion efficiencies, together with advances in stability and upscaling. Despite these advances, their limited stability and need to prove upscaling remain crucial hurdles on the path to commercialization. We summarize recent advances toward commercially viable PSCs and discuss challenges that remain. We expound the development of standardized protocols to distinguish intrinsic and extrinsic degradation factors in perovskites. We review accelerated aging tests in both cells and modules and discuss the prediction of lifetimes on the basis of degradation kinetics. Mature photovoltaic solutions, which have demonstrated excellent long-term stability in field applications, offer the perovskite community valuable insights into clearing the hurdles to commercialization.</P>