Silicon heterojunction (SHJ) solar cells are attracting attention as high-efficiency Si solar cells. The basic SHJ structure is p-type amorphous Si (a-Si)/i-type (non-doped) a-Si/n-type mono-crystalline Si (c-Si). We have developed and actively evolved this SHJ solar cells from early 1990s, and introduced the module equipped with SHJ solar cells named as well-known "HIT". The features of HIT are: (1) high efficiency, (2) good temperature characteristics, that is, a small output decrease even in the temperature environment actually used, (3) easy application to double-sided power generation (bifacial module) using symmetric structure. Although bifacial module has been receiving much attention in recent years, we launched it as early as 2000.
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