Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 11, Pages 4391-4395Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202000199
Keywords
chain length; inorganic perovskite solar cells; photovoltaics; quantum dots; surface chemistry
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Funding
- Director Foundation from Qingdao National Laboratory for Marine Science and Technology [QNLM201702]
- Natural Science Foundation of Guangdong Province [2019B151502061]
- Postdoctoral Research Foundation of China [2019M650231, 2019M663379]
- National Natural Science Foundation of China [61774139, U1802257]
- Fundamental Research Funds for the Central Universities [11618409, 11619311]
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Improved charge extraction and wide spectral absorption promote power conversion efficiency of perovskite solar cells (PSCs). The state-of-the-art carbon-based CsPbBr3 PSCs have an inferior power output capacity because of the large optical band gap of the perovskite film and the high energy barrier at perovskite/carbon interface. Herein, we use alkyl-chain regulated quantum dots as hole-conductors to reduce charge recombination. By precisely controlling alkyl-chain length of ligands, a balance between the surface dipole induced charge coulomb repulsive force and quantum tunneling distance is achieved to maximize charge extraction. A fluorescent carbon electrode is used as a cathode to harvest the unabsorbed incident light and to emit fluorescent light at 516 nm for re-absorption by the perovskite film. The optimized PSC free of encapsulation achieves a maximum power conversion efficiency up to 10.85 % with nearly unchanged photovoltaic performances under 80 %RH, 80 degrees C, or light irradiation in air.
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