Facile Low-energy Synthesis of Mixed-cation Perovskite Quantum Dots for High-performance Photovoltaics
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초록
내용
Cesium-formamidinium lead triiodide (Cs1−xFAxPbI3) perovskite quantum dots (PQDs) are promising candidates for photoactive materials of photovoltaics. However, different reaction temperatures of CsPbI3 and FAPbI3 PQDs with 180 ℃ and 80 ℃ make it difficult for the mixed-cation colloidal PQDs with the one-pot synthesis. Herein, we develop the one-pot synthesis of Cs1−xFAxPbI3 PQDs at 60 ℃ in the open air, reducing the energy consumption and synthesis time. In addition, we find that the Cs+ ion crystallizes more easily than the FA+ ion at 60 ℃ because the temperature effects dominate the crystallization energy over the entropy effect as the temperature increases. This work also facilitates the control of optical properties by fine-tuning the A-site cations of thePQDs for optimizing photovoltaic performance. As a result, our solar cells exhibit power conversion efficiencies up to 11.58 %, which is the highest value among the reported solar cells with QDs synthesized at below 60 ℃.