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Device arrangement is definitely one of the most significant aspects for the performance of the PSC. Depending on the position of the transport layer in the exterior portion, PSC can be classified into two configurations like mesoporous structure and planar structure as depicted in Figure 2.5. These two configurations are further classified into regular (n-i-p) and inverted (p-i-n) as shown in Figure 2.6.

Other two configurations are also possible like ETM-free structure and HTM-free structure, where P-contact is ETM, whereas N-contact is HTM. The brief overview of mesoporous structure and planar structure is discussed further in the chapter.