Abstract
Organic-inorganic hybrid perovskite solar cells are considered as one of the most promising next-generation solar cells due to their advantages of low-cost precursors, high power conversion efficiency (PCE) and easy of processing. In the past few years, the PCEs have climbed from a few to over 20% for perovskite solar cells. Recent developments demonstrate that perovskite exhibits ambipolar semiconducting characteristics, which allows for the construction of planar heterojunction (PHJ) perovskite solar cells. PHJ perovskite solar cells can avoid the use of high-temperature sintered mesoporous metal oxides, enabling simple processing and the fabrication of flexible and tandem perovskite solar cells. In planar heterojunction materials, hole/electron transport layers are introduced between a perovskite film and the anode/cathode. The hole and electron transporting layers are expected to enhance exciton separation, charge transportation and collection. Further, the supporting layer for the perovskite film not only plays an important role in energy-level alignment, but also affects perovskite film morphology, which have a great effect on device performance. In addition, interfacial layers also affect device stability. In this review, recent progress in interfacial engineering for PHJ perovskite solar cells will be reviewed, especially with the molecular interfacial materials. The supporting interfacial layers for the optimization of perovskite films will be systematically reviewed. Finally, the challenges remaining in perovskite solar cells research will be discussed.
Highlights
Clean and renewable energy have become increasingly important for human society due to the increasing demand for energy and environmental concerns
To systematically understand the role of interfacial layers in the fast development of perovskite solar cells, especially the novel molecular interfacial materials, which have the advantages of simple solution processing, a low-temperature annealing process, tunable work function, high mobility, and good compatibility with the perovskite film growth, we present an insightful overview of planar heterojunction (PHJ) perovskite solar cells with interface engineering that was employed recently
The unique combination of virtually all the good properties required in a solar cell provides highlighted interface engineering of the layer under the perovskite film in different materials, perovskite solar cells with excellent performance over other thin-film solar cells
Summary
Clean and renewable energy have become increasingly important for human society due to the increasing demand for energy and environmental concerns. Organic-inorganic hybrid perovskite solar cells are considered one of the most promising generation photovoltaic technologies due to their high PCE, low cost and easy fabrication. Organic-inorganic hybrid solar are considered one cost of the most generation photovoltaicperovskite technologies duecells to their high PCE, low and easypromising fabrication. PCEs of perovskite solar cells have long exciton diffusion length and easy tunable bandgap [1,2,3,4,5,6,7,8,9,10]. The PCEs of perovskite solar cells long exciton diffusion length easy 4%. The developments of different kinds of solar cells are depicted highest PCE among the novel solar cells [11,12,13]. The original workfirst for introduced the development perovskite solar cells was carried out in 2009 by Miyasaka et al, who CH3NHof
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