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Soft Semiconductor Group Marc A. Baldo David Ciudad, Sebastian Reinke Paul Azurne, Matthias Bahlke, Dan Congreve, Jean Anne Currivan, Jiye Lee, Phil Reusswig, Saima Siddiqui, Nick Thompson, Tony Wu Ultra High Vacuum Characterization Thermal Evaporation System • UPS • AFM • STM • KPFM • Solar Cells • Organic LEDs • Luminescent Solar Concentrators Photonic Materials, Devices, and Systems Energy, Power and Electronics Nanoscale Science and Engineering Dry Co2 Lithography • Solar Cells and Organic LEDs with small feature sizes Optics Laboratory 120 3.0 6.6 150 38 P3HT 8 4.3 BCP 4.8 ITO 5.2 4.7 4.9 PEDOT :PSS 4.0 100 3.5 C60 Pc P3HT 2.1 • Solar Simulator • Photoluminescence Quantum Efficiency • External Quantum Efficiency • Optical Cryostat • Micro-positioned Electrical Cryostat • Electromagnet External quantum efficiency (%) Courtesy of Patrick Brown from the ONE LAB Ag 7.0 15 35 15 100 C60 Pentacene (Pc) 80 60 40 20 0 400 450 500 550 600 650 700 Wavelength (nm) Blue = ‘Shared Instrument’ Red = Collaboration Opportunity Research Motivation We seek to exploit the remarkable diversity of soft semiconductors - molecular materials held together by weak van der Waals bonds. In contrast with the painstaking growth requirements of conventional semiconductors, soft semiconductors can be readily and inexpensively deposited on a variety of materials at room temperature. Texas Instruments Sundstrom, et al. J. Phys. Chem. B. 103 2327 (1999) An soft semiconductor circuit in photosynthesis. By exploiting excitons and short range order, the energy payback time in photosynthesis is as short as 2 days. Pulling a silicon crystal from the melt. The manufacturing of highly ordered semiconductors for solar cells and LEDs is energy intensive and expensive. The energy payback time for Si solar cells is about 2 years. We focus on two areas: organic light emitting devices, and low cost solar cells. We also have a growing interest in low energy switches. On-going Research Singlet Exciton Fission solar radiation (b) PV PV/DBR PV Magnetic Logic (c) DBR/PV Laser output power (a.u.) (a) solar radiation Solar Concentrators Integrated Organic Electronics ON State: Output Current High Input Tunnel Junction Output z y x Clock Soft ferromagnet OFF State: Output Current Low Antiferromagnet Domain wall (DW) w power (a.u.) Input t L Tony Wu Jiye Lee Phil Reusswig Paul Azunre Sebastian Reinke Jean Anne Currivan Dan Congreve Nick Thompson Matthias Bahlke Saima Siddiqui David Ciudad http://softsemi.mit.edu