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Thiophene-Functionalized Hybrid Perovskite Microrods and their Application in Photodetector Devices for Investigating Charge Transport Through Interfaces in Particle-Based Materials

Thiophene-Functionalized Hybrid Perovskite Microrods and their Application in Photodetector Devices for Investigating Charge Transport Through Interfaces in Particle-Based Materials

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KOLLEK, Tom, Daniel WURMBRAND, Susanne T. BIRKHOLD, Eugen ZIMMERMANN, Julian KALB, Lukas SCHMIDT-MENDE, Sebastian POLARZ, 2017. Thiophene-Functionalized Hybrid Perovskite Microrods and their Application in Photodetector Devices for Investigating Charge Transport Through Interfaces in Particle-Based Materials. In: ACS Applied Materials & Interfaces. 9(1), pp. 1077-1085. ISSN 1944-8244. eISSN 1944-8252. Available under: doi: 10.1021/acsami.6b12466

@article{Kollek2017-01-11Thiop-37568, title={Thiophene-Functionalized Hybrid Perovskite Microrods and their Application in Photodetector Devices for Investigating Charge Transport Through Interfaces in Particle-Based Materials}, year={2017}, doi={10.1021/acsami.6b12466}, number={1}, volume={9}, issn={1944-8244}, journal={ACS Applied Materials & Interfaces}, pages={1077--1085}, author={Kollek, Tom and Wurmbrand, Daniel and Birkhold, Susanne T. and Zimmermann, Eugen and Kalb, Julian and Schmidt-Mende, Lukas and Polarz, Sebastian} }

Zimmermann, Eugen Thiophene-Functionalized Hybrid Perovskite Microrods and their Application in Photodetector Devices for Investigating Charge Transport Through Interfaces in Particle-Based Materials 2017-02-17T12:10:26Z Kollek, Tom Wurmbrand, Daniel Kollek, Tom Polarz, Sebastian Schmidt-Mende, Lukas 2017-01-11 Particle-based semiconductor materials are promising constituents of future technologies. They are described by unique features resulting from the combination of discrete nanoparticle characteristics and the emergence of cooperative phenomena based on long-range interaction within their superstructure. (Nano)particles of outstanding quality with regards to size and shape can be prepared via colloidal synthesis using appropriate capping agents. The classical capping agents are electrically insulating, which impedes particle-particle electronic communication. Consequently, there exists a high demand for realizing charge transport through interfaces especially for semiconductors of relevance like hybrid perovskites (HYPEs), for example, CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPI) as one of the most prominent representatives. Of particular interest are crystals in the micrometer range, as they possess synergistic advantages of single crystalline bulk properties, shape control as well as the possibility of being functionalized. Here we provide a synthetic strategy toward thiophene-functionalized single crystalline MAPI microrods originating from the single source precursor CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>TEG<sub>2</sub> (TEG = triethylene glycol). In the dark, the microrods show enhanced charge transport characteristics of holes over 2 orders of magnitude compared to microscale cuboids with insulating alkyl surface modifiers and nonfunctionalized random sized particles. In large-area prototype photodetector devices (2.21 cm<sup>2</sup>), the thiophene functionalization improves the response times because of the interparticle charge transport (t<sub>ON</sub> = 190 ms, t<sub>OFF</sub> = 430 ms) compared to alkyl-functionalized particles (t<sub>ON</sub> = 1055 ms, t<sub>OFF</sub> = 60 ms), at similar responsivities of 0.65 and 0.71 mA W<sup>-1</sup>, respectively. Further, the surface functionalization and crystal grains on the micrometer scale improve the device stability. Therefore, this study provides clear evidence for the interplay and importance of crystal size, shape and surface modification of MAPI crystals, which is of major importance in every optoelectronic device. Kalb, Julian Polarz, Sebastian Birkhold, Susanne T. Birkhold, Susanne T. Wurmbrand, Daniel Kalb, Julian eng Zimmermann, Eugen 2017-02-17T12:10:26Z Schmidt-Mende, Lukas

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