Abstract
The use of solution-processed photovoltaics is a low cost, low material-consuming way to harvest abundant solar energy. Organic semiconductors based on perovskite or colloidal quantum dot photovoltaics have been well developed in recent years; however, stability is still an important issue for these photovoltaic devices. By combining solution processing, chemical treatment, and sintering technology, compact and efficient CdTe nanocrystal (NC) solar cells can be fabricated with high stability by optimizing the architecture of devices. Here, we review the progress on solution-processed CdTe NC-based photovoltaics. We focus particularly on NC materials and the design of devices that provide a good p–n junction quality, a graded bandgap for extending the spectrum response, and interface engineering to decrease carrier recombination. We summarize the progress in this field and give some insight into device processing, including element doping, new hole transport material application, and the design of new devices.
Highlights
Solution-processed thin film solar cells offer the opportunity to decrease the manufacturing cost and the usage of raw materials, which may allow module manufacture to compete with traditional energy production
We review the advances in solution-processed CdTe NC solar cells and discuss future innovations that are required to further increase the power conversion efficiency (PCE) to ~15% to allow commercial application
We review the latest progress in the architecture design of devices and present some perspectives on the further development of CdTe NC solar cells towards ~15% PCE [13]
Summary
Solution-processed thin film solar cells offer the opportunity to decrease the manufacturing cost and the usage of raw materials, which may allow module manufacture to compete with traditional energy production. The sizes of CdTe NCs are well controlled, and they can be dispersed in many organic solvents, such as pyridine, n-propyl alcohol, and even deionized water [9,10,11,12], which permits photovoltaic device fabrication using solution processing. We review the advances in solution-processed CdTe NC solar cells and discuss future innovations that are required to further increase the power conversion efficiency (PCE) to ~15% to allow commercial application. Sci. 2019, 9, 1885 combinations of devices have allowed the development of some forms of graded bandgap design that enable efficient collection of electrons and holes. We review the latest progress in the architecture design of devices and present some perspectives on the further development of CdTe NC solar cells towards ~15% PCE [13]
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