The most critical question concerning whether mesostructured or planar heterojunction perovskite solar cells
will eventually dominate is what
the exciton or the electron and hole diffusion lengths are in these materials.

麻煩英文好的帥哥美女給拆解一下這個英文的句子，is what 這個地方直接把我弄糊涂了。

is what 這個地方是什么從句呀？麻煩講解一下。

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