Enhanced Grain Size, Photoluminescence, and Photoconversion Efficiency with Cadmium Addition during the Two-Step Growth of CH3NH3PbI3
| Autor: | Suneth C. Watthage, Adam B. Phillips, Michael J. Heben, Randy J. Ellingson, Niraj Shrestha, Zhaoning Song, Paul J. Roland, Geethika K. Liyanage |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Cadmium Materials science Photoluminescence Iodide Energy conversion efficiency Analytical chemistry chemistry.chemical_element Mineralogy 02 engineering and technology Carrier lifetime 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Grain size 0104 chemical sciences Crystallinity chemistry General Materials Science 0210 nano-technology Solution process |
| Zdroj: | ACS Applied Materials & Interfaces. 9:2334-2341 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Control over grain size and crystallinity is important for preparation of methylammonium lead iodide (MAPbI3) solar cells. We explore the effects of using small concentrations of Cd2+ and unusually high concentrations of methylammonium iodide during the growth of MAPbI3 in the two-step solution process. In addition to improved crystallinity and an enhancement in the size of the grains, time-resolved photoluminescence measurements indicated a dramatic increase in the carrier lifetime. As a result, devices constructed with the Cd-modified perovskites showed nearly a factor of 2 improvement in the power conversion efficiency (PCE) relative to similar devices prepared without Cd addition. The grains also showed a higher degree of orientation in the ⟨110⟩ direction, indicating a change in the growth mechanism, and the films were compact and smooth. We propose a Cd-modified film growth mechanism that invokes a critical role for low-dimensional Cd perovskites to explain the experimental observations. |
| Databáze: | OpenAIRE |
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