(Talk2019.9.20) Composition Tuned Hybrid Perovskites: From Materials Engineering & Device Design for Efficient, Stable Perovskite Solar Cells + System Scaling through Heterogeneous
(Talk2019.9.20) Composition Tuned Hybrid Perovskites: From Materials Engineering & Device Design for Efficient, Stable Perovskite Solar Cells + System Scaling through Heterogeneous Integration
WELCOME ALL TO COME →
#Time : September 20, 2019 Friday 15:00 — 16:20PM
#Venue : R108,1F Engineering Building 4, NCTU
#Speaker / Topic: :
15:00~15:40 Composition Tuned Hybrid Perovskites: From Materials Engineering & Device Design for Efficient, Stable Perovskite Solar Cells
Prof. C.P. Wong / Georgia Institute of Technology, USA
15:40~16:20 System Scaling through Heterogeneous Integration
Prof. Madhavan Swaminathan / Georgia Institute of Technology, USA
#Host: Prof. Tseung-Yuen Tseng 曾俊元 / Institute of Electronics, NCTU
#Language : English
#Topic : Composition Tuned Hybrid Perovskites: From Materials Engineering & Device Design for Efficient, Stable Perovskite Solar Cells
A perovskite solar cell is a type of solar cell which includes a perovskite structured compound, most commonly a hybrid organic-inorganic lead or tin halide-based material, as the light-harvesting active layer. Perovskite materials such as methylammonium lead halides and all-inorganic cesium lead halide, are cheap to produce and simple to manufacture.
(1) In traditional sequential deposition, compact PbI2 film may hinder the diffusion of MAI solution across the entire PbI2 film, thus leading to the unreacted PbI2 residue in the interface between perovskite and TiO2. To address the issue of PbI2 residue, we developed a new method to synthesize porous PbI2 film. We started from the precursor of PbAc2 and MAI with the molar ratio of 1:2, and thermally unstable CH3NH3(CH3COO) will be released under heating condition, thus producing pores in the PbI2 film due to volume contraction. After loading with MAI solution, p-PbI2 will improve the conversion of PbI2 to perovskite.
(2) Not only the instability issue caused by spiro, we also know that spiro is the most expensive material in such device structure. Actually, researchers have made some efforts to develop new HTLs to replace spiro, which can be mainly classified into two types: synthesizing updoped organic materials and developing low-cost inorganic materials. However, complex synthesis process may hinder large-scale production of organic materials. On the other hand, PSCs with PbS and CuI HTLs suffer from the issue of low-efficiency, and CuSCN can react with perovskite. In this regard, I’d like to propose an alternative p-type material: NiO. Low-temperature solution-processed NiOx HTL can significantly improve the stability of the whole device.
#Topic : System Scaling through Heterogeneous Integration
A combination of "Moore" (IC) and "More than Moore" (package) scaling has led to the shrinking of electronic systems over the last several decades. As scaling continues beyond CMOS to include advanced devices, scaling of the package needs to continue to enable system scaling, leading to the integration and miniaturization of systems. This requires new technologies for package integration which when connected to assembled ICs using advanced devices leads to System on Package (SoP) solutions that have superior performance, functionality and size as compared to current technologies. This presentation will discuss advanced SoP platforms for integration with a focus on heterogeneity for a variety of applications that include AI, HPC, Power Electronics, mmWave to name a few. The inter-disciplinary nature of the research will be highlighted based on faculty interactions between four different schools at GT.