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Han, Mingu,Kim, Hyungsoo,Seo, Hyungtak,Ma, Biwu,Park, Ji‐,Woong WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.47
<P><B>A new approach to improve the power conversion efficiency</B> of polymer bulk‐heterojunction solar cells is demonstrated by generating a silica‐like passivation layer embedded along the three‐dimensionally intertwined interfaces between the nanoscopic domains of P3HT and PCBM by addition of an aymmetric block copolymer containing a short organo‐silica precursor.</P>
Flexible, highly efficient all-polymer solar cells
김영권,김태수,김재한,강태의,이창연,강현범,신민관,( Cheng Wang ),( Biwu Ma ),정운룡,김택수,김범준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Polymer solar cells have shown great potential as flexible and portable power generators. These devices should offer good mechanical endurance with high power-conversion efficiency for viability in commercial applications. In this work, we developed highly efficient and mechanically stable PSCs based on all-polymer solar cells (all-PSCs) composed of polymer donor and polymer acceptor. These systems exhibit one of the highest PCE values among the reported all-PSCs (6.64%). Also, our all-PSCs had even better performance than the control polymer-fullerene devices with phenyl-C61-butyric acid methyl ester (PCBM) as the electron acceptor (6.12%). More importantly, our all-PSCs exhibited dramatically enhanced strength and flexibility compared with polymer/PCBM devices. The superior mechanical properties of all-PSCs makes them much better candidates for applications in flexible and portable devices.
Liang, Xiaogan,Chen, Teresa,Jung, Yeon-Sik,Miyamoto, Yoshikazu,Han, Gang,Cabrini, Stefano,Ma, Biwu,Olynick, Deirdre L. American Chemical Society 2010 ACS NANO Vol.4 No.5
<P>We present a systematic study on the thermal nanoimprinting of a boron subphthalocynamine molecule, 2-allylphenoxy-(subphthalocyaninato)boron(III) (SubPc-A), which represents a class of attractive small-molecular weight organic compounds for organic-based photovoltaics (OPV). The final equilibrium imprinted feature profile strongly depends on the imprinting temperature. The highest feature aspect ratio (or contrast) occurs at a specific window of imprinting temperatures (80−90 °C). X-ray diffraction indicates that the nanoimprint at such a temperature window can induce high-degree molecular stacking, which can help stabilize the imprinted features. Outside this window, we observed a pronounced relaxation of imprinted features after template removal, which is attributed to the surface diffusion. Key factors affecting the final equilibrium profile of the imprinted features were simulated. From the simulation, it was found that the crystallization-induced anisotropy of surface energy stabilized imprinted features. Simulated parameters such as stable feature aspect ratio and pitch agree well with experimental data. Such work provides an important guideline for optimizing the nanopatterning of small-molecular-weight organic compounds.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-5/nn100075t/production/images/medium/nn-2010-00075t_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn100075t'>ACS Electronic Supporting Info</A></P>