Except a lot of the taste comes from receptors in the nose. They get the most info with the food on the top. The tongue has only very basic information about the food and is there to determine if we should spit it out because it is poison or get as much as we can because it is high caloric stuff.
Fun fact, the way the tongue works is very different from how many people think. Each little taste bud can detect one or two aspects depending on its specialization. They can detect sweet, savoriness (umami) , bitter and sour. Salt is detected in a different way. Sweet and umami are detected by the same bud, where bitter and sour each have their own specialized buds. Most of the little pink buds on the tongue aren’t taste buds, but there are still a lot of taste buds all over the tongue.
With the taste buds the brain takes a “picture” of the food. It receives a signal from each taste bud in regards to the level of taste they receive. The brain learns to interpret these pictures in what the food tastes like, supplemented by the nose and the salt levels. Since each tongue is different and each brain is different, tastes are very personal and can be different for different people. Tastes evolve over time, so it can even differ for the same person as they get older.
When first drinking something like coffee or beer, the brain gets very confused. These are complex tastes and the brain has a hard time of figuring out what it’s tasting. Since it can be very bitter with coffee for example, the brain thinks it might be poisonous, so revulsion is often a first response. However when sticking with it the brain learns to make sense of the jumble and might like the complexity. These are so called acquired tastes.
Did a simple calculation to see how long it would take for such a tiny solar panel they made to charge the phone. And that’s not using the phone (turned off) and without concern for overheating the phone by putting it in direct sunlight. The efficiency of regular solar panels are bad, this transparent thing is cool but way worse than regular panels. In an optimized scenario such as in the paper (not realistic) it would take 60 hours for a full charge. Since there aren’t usually 24 hours of sunlight (let alone full direct sunlight) it would probably take well over a week to charge.
Self charging phones using solar isn’t a thing that’s practically possible.
Even at high efficiency (which isn’t possible) it isn’t practical since phones don’t do well in the sun and are usually stored in pockets, bags and often have covers over them. Plus they are mostly used inside where there isn’t sun, or outside where most of the times there also isn’t a lot of sun.
Just put a solar panel on the roof, that’s the best place for solar panels.