Science and Technology · Renewable Energy

Consider the following statements regarding perovskite solar cell technology: I. These solar cells are known for high power-conversion efficiency, but their long-term stability under sunlight remains a challenge. II. Compared with conventional silicon-based solar cells, perovskite cells are presently more expensive to manufacture even though their efficiency levels are approaching those of silicon cells. III. Disposal of such cells may raise environmental concerns because certain perovskite materials contain toxic heavy metals such as lead. Which of the statements given above are correct?