We present the most downloaded papers from the physica status solidi family of journal in May, spanning subject areas such as the important problem of efficiency droop in nitride LEDs, defect centers in diamond and the characterization of graphene, and much more!

physica status solidi (RRL)

• R. Sbiaa, H. Meng, S. N. Piramanayagam
  Materials with perpendicular magnetic anisotropy for magnetic random access memory [Review@RRL]
  Phys. Status Solidi RRL 2011, vol. 5, p. 413
• Woong-Sun Kim, Yeon-Keon Moon, Sih Lee, Byung-Woo Kang, Tae-Seok Kwon, Kyung-Taek Kim, Jong-Wan Park
  Copper source/drain electrode contact resistance effects in amorphous indium–gallium–zinc-oxide thin film transistors [Rapid Research Letter]
  Phys. Status Solidi RRL 2009, vol. 3, p. 239
• B. Hoex, M. C. M. van de Sanden, J. Schmidt, R. Brendel, W. M. M. Kessels
  Surface passivation of phosphorus-diffused n⁺-type emitters by plasma-assisted atomic-layer deposited Al₂O₃ [Rapid Research Letter]
  Phys. Status Solidi RRL 2012, vol. 6, p. 4
• Jan Nievendick, Jan Specht, Martin Zimmer, Lorenz Zahner, William Glover, David Stüwe, Jochen Rentsch
  Formation of a honeycomb texture for multicrystalline silicon solar cells using an inkjetted mask [Rapid Research Letter]
  Phys. Status Solidi RRL 2012, vol. 6, p. 7
• E. Fortunato, R. Martins
  Where science fiction meets reality? With oxide semiconductors! [Expert Opinion]
  Phys. Status Solidi RRL 2011, vol. 5, p. 336
• K. P. O’Donnell, M. Auf der Maur, A. Di Carlo, K. Lorenz, the SORBET consortium
  It’s not easy being green: Strategies for all-nitrides, all-colour solid state lighting [Expert Opinion]
  Phys. Status Solidi RRL 2012, vol. 6, p. 49
• Prasanna Sivasubramani, Tae Joo Park, Brian E. Coss, Antonio Lucero, Jie Huang, Barry Brennan, Yu Cao, Debdeep Jena, Huili (Grace) Xing, Robert M. Wallace, Jiyoung Kim
  In-situ X-ray photoelectron spectroscopy of trimethyl aluminum and water half-cycle treatments on HF-treated and O₃-oxidized GaN substrates [Rapid Research Letter]
  Phys. Status Solidi RRL 2012, vol. 6, p. 22
• Takeshi Tanaka, Huaping Liu, Shunjiro Fujii, Hiromichi Kataura
  From metal/semiconductor separation to single-chirality separation of single-wall carbon nanotubes using gel [Review@RRL]
  Phys. Status Solidi RRL 2011, vol. 5, p. 301
• Saraswathi Chirakkara, S. B. Krupanidhi
  Gallium and indium co-doped ZnO thin films for white light emitting diodes [Rapid Research Letter]
  Phys. Status Solidi RRL 2012, vol. 6, p. 34

physica status solidi (a)

• Joachim Piprek
  Efficiency droop in nitride-based light-emitting diodes [Feature Article]
  Phys. Status Solidi A 2010, vol. 207, p. 2217
• Philip A. Shields, Martin D. B. Charlton, Christopher J. Lewins, Xiang Gao, Duncan W. E. Allsopp, Wang N. Wang, Bedwyr Humphreys
  Effect of coalescence layer thickness on the properties of thin-chip InGaN/GaN light emitting diodes with embedded photonic quasi-crystal structures [Editor’s Choice]
  Phys. Status Solidi A 2012, vol. 209, p. 451
• F. Jelezko, J. Wrachtrup
  Single defect centres in diamond: A review [Review Article]
  Phys. Status Solidi A 2006, vol. 203, p. 3207
• Lili Cui, Xiaofeng Lu, Danming Chao, Hongtao Liu, Yongxin Li, Ce Wang
  Graphene-based composite materials with high dielectric permittivity via an in situ reduction method [Original Paper]
  Phys. Status Solidi A 2011, vol. 208, p. 459
• Carolin M. Fella, Alexander R. Uhl, Yaroslav E. Romanyuk, Ayodhya N. Tiwari
  Cu₂ZnSnSe₄ absorbers processed from solution deposited metal salt precursors under different selenization conditions [Editor’s Choice]
  Phys. Status Solidi A 2012, vol. 209, p. 1043
• Marcos Soldera, Kurt Taretto, Thomas Kirchartz
  Comparison of device models for organic solar cells: Band-to-band vs. tail states recombination [Original Paper]
  Phys. Status Solidi A 2012, vol. 209, p. 207
• D. Zhu, C. McAleese, M. Häberlen, M. J. Kappers, N. Hylton, P. Dawson, G. Radtke, M. Couillard, G. A. Botton, S.-L. Sahonta, C. J. Humphreys
  High-efficiency InGaN/GaN quantum well structures on large area silicon substrates [Original Paper]
  Phys. Status Solidi A 2012, vol. 209, p. 13
• E. William Cowell, Christopher C. Knutson, Nicholas A. Kuhta, William Stickle, Douglas A. Keszler, John F. Wager
  Engineering anisotropic dielectric response through amorphous laminate structures [Original Paper]
  Phys. Status Solidi A 2012, vol. 209, p. 777
• Park, Yensil; Soon Choi, Kyoung; Young Kim, Soo
  Graphene oxide/PEDOT:PSS and reduced graphene oxide/PEDOT:PSS hole extraction layers in organic photovoltaic cells [Original Paper]
  Phys. Status Solidi A, 10.1002/pssa.201228040
• Prashant K. Sarswat, Michael L. Free
  Demonstration of a sol–gel synthesized bifacial CZTS photoelectrochemical cell [Original Paper]
  Phys. Status Solidi A 2011, vol. 208, p. 2861

 physica status solidi (b) 

• Ado Jorio, Erlon H. Martins Ferreira, Marcus V. O. Moutinho, Fernando Stavale, Carlos A. Achete, Rodrigo B. Capaz
  Measuring disorder in graphene with the G and D bands [Original Paper]
  Phys. Status Solidi B 2010, vol. 247, p. 2980
• Janik Wolters, Günter Kewes, Andreas W. Schell, Nils Nüsse, Max Schoengen, Bernd Löchel, Tobias Hanke, Rudolf Bratschitsch, Alfred Leitenstorfer, Thomas Aichele, Oliver Benson
  Coupling of single nitrogen-vacancy defect centers in diamond nanocrystals to optical antennas and photonic crystal cavities [Editor’s Choice]
  Phys. Status Solidi B 2012, vol. 249, p. 918
• Alper Ince, Şakir Erkoç
  Molecular-dynamics simulations of silicene nanoribbons under strain [Original Paper]
  Phys. Status Solidi B 2012, vol. 249, p. 74
• C. Klingshirn
  ZnO: From basics towards applications [Review Article]
  Phys. Stat

  us Solidi B 2007, vol. 244, p. 3027

• Daniel Dregely, Klas Lindfors, Jens Dorfmüller, Mario Hentschel, Merle Becker, Jörg Wrachtrup, Markus Lippitz, Ralf Vogelgesang, Harald Giessen
  Plasmonic antennas, positioning, and coupling of individual quantum systems [Feature Article]
  Phys. Status Solidi B 2012, vol. 249, p. 666
• C. P. Liu, H. E. Wang, T. W. Ng, Z. H. Chen, W. F. Zhang, C. Yan, Y. B. Tang, I. Bello, L. Martinu, W. J. Zhang, S. K. Jha
  Hybrid photovoltaic cells based on ZnO/Sb₂S₃/P3HT heterojunctions [Original Paper]
  Phys. Status Solidi B 2012, vol. 249, p. 627
• Marius Grundmann, Christof P. Dietrich
  Whispering gallery modes in deformed hexagonal resonators [Feature Article]
  Phys. Status Solidi B 2012, vol. 249, p. 871
• Jakob J. Brondijk, Francesco Maddalena, Kamal Asadi, Herman J. van Leijen, Martin Heeney, Paul W. M. Blom, Dago M. de Leeuw
  Carrier-density dependence of the hole mobility in doped and undoped regioregular poly(3-hexylthiophene) [Original Paper]
  Phys. Status Solidi B 2012, vol. 249, p. 138
• B. K. Meyer, H. Alves, D. M. Hofmann, W. Kriegseis, D. Forster, F. Bertram, J. Christen, A. Hoffmann, M. Straßburg, M. Dworzak, U. Haboeck, A. V. Rodina
  Bound exciton and donor–acceptor pair recombinations in ZnO [Feature Article]
  Phys. Status Solidi B 2004, vol. 241, p. 231
• Cinzia Casiraghi
  Raman intensity of graphene [Original Paper]
  Phys. Status Solidi B 2011, vol. 248, p. 2593

 physica status solidi (c)

• Tohru Honda, Naoyuki Sakai, Shigetoshi Komiyama, Masato Hayashi, Tatsuhiro Igaki
  Reduction of reverse-bias leakage current in GaN-based Schottky-type light-emitting diodes by surface modification using the aluminum facepack technique [ICNS-9 – Contributed Article]
  physica status solidi c 2012, vol. 9, p. 778
• Akio Yamamoto, Md. R. Islam, Ting-Ting Kang, Akihiro Hashimoto
  Recent advances in InN-based solar cells: status and challenges in InGaN and InAlN solar cells [E-MRS-A – Invited Article]
  physica status solidi c 2010, vol. 7, p. 1309
• Feng Xie, Hai Lu, Dunjun Chen, Rong Zhang, Youdou Zheng
  GaN MSM photodetectors fabricated on bulk GaN with low dark-current and high UV/visible rejection ratio [Contributed Article]
  physica status solidi c 2011, vol. 8, p. 2473
• G. Xiong, U. Pal, J. G. Serrano, K. B. Ucer, R. T. Williams
  Photoluminesence and FTIR study of ZnO nanoparticles: the impurity and defect perspective [Original Paper]
  physica status solidi c 2006, vol. 3, p. 3577
• Tooru Tanaka, Daisuke Kawasaki, Mitsuhiro Nishio, Qixin Guo, Hiroshi Ogawa
  Fabrication of Cu₂ZnSnS₄ thin films by co-evaporation [Original Paper]
  physica status solidi c 2006, vol. 3, p. 2844
• Hideaki Araki, Yuki Kubo, Kazuo Jimbo, Win Shwe Maw, Hironori Katagiri, Makoto Yamazaki, Koichiro Oishi, Akiko Takeuchi
  Preparation of Cu₂ZnSnS₄ thin films by sulfurization of co-electroplated Cu-Zn-Sn precursors [Contributed Article]
  physica status solidi c 2009, vol. 6, p. 1266
• M. Willander, P. Klason, L. L. Yang, Safaa M. Al-Hilli, Q. X. Zhao, O. Nur
  ZnO nanowires: chemical growth, electrodeposition, and application to intracellular nano-sensors [Invited Article]
  physica status solidi c 2008, vol. 5, p. 3076
• M. Khardani, M. Bouaïcha, B. Bessaïs
  Bruggeman effective medium approach for modelling optical properties of porous silicon: comparison with experiment [Original Paper]
  physica status solidi c 2007, vol. 4, p. 1986
• Noriko Moritake, Yuki Fukui, Masatoshi Oonuki, Kunihiko Tanaka, Hisao Uchiki
  Preparation of Cu₂ZnSnS₄ thin film solar cells under non-vacuum condition [Contributed Article]
  physica status solidi c 2009, vol. 6, p. 1233
• Christine Chory, Folker Zutz, Florian Witt, Holger Borchert, Jürgen Parisi
  Synthesis and characterization of Cu₂ZnSnS₄ [Contributed Article]
  physica status solidi c 2010, vol. 7, p. 1486