Thought 1: Polymer cells are an untested technology such that simply increasing the efficiency may not make them practical.
Note that increasing the efficiency 38% (e.g. from 10% to 13.8%) still would not get then in the same league as crystalline silicon (17%+).
Now it if increased the efficiency TO 38% we would really have something.
Thought 2: It is often a long road from a lab scale to a production scale process.
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