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This talk explores the promise of Organic Photovoltaics (OPV) through materials design, low-temperature processing, lightweight, low-cost materials, and roll-to-roll fabrication. It discusses the path to commercialization focusing on efficiency, lifetime, and low-cost fabrication, highlighting the state-of-the-art tandem technology. The advantages of tandem structures are presented, including increased absorption length and reduced thermalization losses. The talk delves into device structures, active materials, and optical modeling to optimize performance. A key focus is on a developed model predicting tandem device characteristics, with the use of solvent vapor annealing to enhance exciton diffusion and improve JSC. Acknowledgements are given to supporting organizations. The solvent annealing of DPSQ/C60 cells is also discussed, emphasizing the improvements in bulk crystallinity and device performance.
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Organic Photovoltaics The promise of OPV • Materials design • Low-temperature processing • Lightweight, low-cost materials • Roll-to-roll fabrication 7/12/2012 PARC Talk 2
Path to Commercialization • Efficiency • Lifetime • Low-cost fabrication 7/12/2012 PARC Talk 3
State of the Art 7/12/2012 PARC Talk 4
Tandem • Advantages • Increased absorption length • Decrease thermalization losses • Design requirements • Current must be matched in the subcells optical model Metal Back sub-cell Interlayer Front sub-cell ITO Glass 7/12/2012 PARC Talk 5
Literature 6.1% 5.2% 7/12/2012 PARC Talk 6
Active Materials DPSQ SubPc 7/12/2012 PARC Talk 7
Device Structure Ag BCP C70 SubPc:C70 MoO3 Ag PTCBI C70 DPSQ MoO3 ITO Glass 7/12/2012 PARC Talk 8
Optical Modeling SubPc:C70 DPSQ PTCBI MoO3 MoO3 BCP C70 C70 7/12/2012 PARC Talk 9
Single-cell devices Ag Ag MoO3 30 nm BCP 7 nm Ag 0.1 nm C70 3 nm PTCBI 5 nm SubPc:C70 29 nm C70 10 nm MoO35nm 13.1 nm DPSQ ITO Glass MoO3 20.5 nm ITO Glass 7/12/2012 PARC Talk 10
Modeling Device Characteristics 7/12/2012 PARC Talk 11
Optimization Ag BCP 7 nm C70 3 nm SubPc:C70 Y nm MoO3 5 nm Ag 0.1 nm PTCBI 5 nm C70 X nm DPSQ 13 nm MoO3 20 nm ITO Glass 7/12/2012 PARC Talk 12
Device Characteristics Ag BCP 7 nm C70 3 nm SubPc:C70 29 nm MoO3 5 nm Ag 0.1 nm PTCBI 5 nm C70 10 nm DPSQ 13 nm MoO3 20 nm ITO Glass 7/12/2012 PARC Talk 13
Quantum Efficiency 7/12/2012 PARC Talk 14
Device Performance 7/12/2012 PARC Talk 15
Summary • Developed a model to predict tandem J-V characteristics • Utilized solvent vapor annealing to increase DPSQ exciton diffusion length by ~100% • Incorporated C70, increasing JSC by >30% for each sub-cell • Fabricated a tandem device with ηP = 6.6% 7/12/2012 PARC Talk 16
Acknowledgements Optoelectronic Components and Materials Group Supported in part by AFOSR, DOE Sunshot Program, MKE Korea, and Global Photonic Energy Corp. 7/12/2012 PARC Talk 17
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Solvent Annealing of DPSQ/C60 cells DPSQ • Improved bulk crystallinity excitondiffusion (JSC) • Crystalline interfaces polaron recombination (VOC) • Optimum bilayer device: Crystalline bulk and disordered D-A interface DPSQ C60 PTCBI Ag MoO3 ITO 7/12/2012 PARC Talk
