Peppers (for the most part) are self -pollinated and problems with pollination should not arise.
When the peppers on the windowsill begin to intensively tie, at this time they need feeding fertilizers (phosphorus and potassium) and backlight in the short and dark days of winter pores. Peppers also need daily spraying and once a month — in a warm shower (while the land in containers must be covered with polyethylene film). If aphids appear, then you need to clean it with your hands and rinse it with water.