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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Enhancing the efficiency of PTB7-Th:CO i 8DFIC-based ternary solar cells with versatile third components Wei Li , Zuo Xiao , Joel As. Smith , Jinlong Cai , Donghui Li , Rachel C. Kilbride , Emma L. K. Spooner , Onkar S. Game , Xianyi Meng , Dan Liu , Richard A. L. Jones , David G. Lidzey , Liming Ding , Tao Wang Applied Physics Reviews 6 DOI: 10.1063/1.5125438 Diamond Proposal Number(s): [20419] Show Abstract ▼ Abstract: Traditional single-junction binary organic solar cells suffer from narrow absorption windows, limiting their ability to harvest photons. One promising approach to avoid this issue is through the construction of a ternary system to enhance the spectral response and efficiency. However, the complex morphology and photophysical processes within ternary blends leave the criteria of an effective third component unclear, and so they remain a challenge. In this work, we report on the fabrication of PTB7-Th:COi8DFIC-based ternary solar cells with enhanced efficiency by employing either a polymer donor or a nonfullerene acceptor as the third component. We demonstrate that the third component is highly associated with the condensed state of the host acceptor and is the primary factor in determining efficiency improvement. The π-π stacking molecular packing of COi8DFIC helps to maintain the optimal phase separation within the ternary blends and improves both the hole and electron charge mobilities, resulting in enhanced power conversion efficiency of over 14%, compared to 13.1% in binary devices. We also found an excessive amount of polymer donor or nonfullerene acceptor increases the phase separation and encourages lamellar crystallization with the host acceptor domain, resulting in reduced light-harvesting and external quantum efficiencies at long wavelengths. Our results provide a rational guide to selecting the third component to fabricate high-performance nonfullerene-based ternary solar cells.	Dec 2019
I13-1-Coherence	X-ray ptychography on low-dimensional hard-condensed matter materials Xiaowen Shi , Nicolas Burdet , Bo Chen , Gang Xiong , Robert Streubel , Ross Harder , Ian K. Robinson Applied Physics Reviews 6 DOI: 10.1063/1.5045131 Open Access Show Abstract ▼ Abstract: Tailoring structural, chemical, and electronic (dis-)order in heterogeneous media is one of the transformative opportunities to enable new functionalities and sciences in energy and quantum materials. This endeavor requires elemental, chemical, and magnetic sensitivities at the nano/atomic scale in two- and three-dimensional space. Soft X-ray radiation and hard X-ray radiation provided by synchrotron facilities have emerged as standard characterization probes owing to their inherent element-specificity and high intensity. One of the most promising methods in view of sensitivity and spatial resolution is coherent diffraction imaging, namely, X-ray ptychography, which is envisioned to take on the dominance of electron imaging techniques offering with atomic resolution in the age of diffraction limited light sources. In this review, we discuss the current research examples of far-field diffraction-based X-ray ptychography on two-dimensional and three-dimensional semiconductors, ferroelectrics, and ferromagnets and their blooming future as a mainstream tool for materials sciences.	Mar 2019

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