Abstract
This paper focuses on nano-morphology-controlled small-molecule organic solar cells without solvent treatment for high power-conversion efficiencies (PCEs). The maximum high PCE reaches up to 7.22% with a bulk-heterojunction (BHJ) thickness of 320 nm. This high efficiency was obtained by eliminating solvent additives such as 1,8-diiodooctane (DIO) to find an alternative way to control the domain sizes in the BHJ layer. Furthermore, the generalized transfer matrix method (GTMM) analysis has been applied to confirm the effects of applying a different thickness of BHJs for organic solar cells from 100 to 320 nm, respectively. Finally, the study showed an alternative way to achieve high PCE organic solar cells without additive solvent treatments to control the morphology of the bulk-heterojunction.
Highlights
During the last decades, bulk-heterojunction (BHJ) small-molecule organic solar cells (OSCs) have received more research attention [1,2,3,4,5,6,7,8,9]
Among the many research issues, surface morphology control is an essential part of the spin-coating process to form thin films to get high-efficiency OSCs [2]
Despite polymeric BHJ OSCs reported with high power conversion efficiencies (PCEs), others have pointed out some drawbacks
Summary
Bulk-heterojunction (BHJ) small-molecule organic solar cells (OSCs) have received more research attention [1,2,3,4,5,6,7,8,9]. It has been reported that solution-processed small-molecule BHJ solar cells have a well-defined molecular structure with intermediate dimensions [1,2]. A study suggests the treatment of the active layer by drying speed or washout with methanol [16] This is not the fundamental method to solve the additional solvent problem issue. It does not always guarantee a high efficiency of OSCs. strong aggregation is another problem during the spin-coating process used to produce a high quality of thin film for SM. We report solution-processed high-efficiency SM BHJ OSCs without a DIO additive solvent treatment. A generalized transfer matrix method (GTMM) for the optical modeling analysis result will be introduced to confirm the behavior of light absorption in the BHJ photoactive layer of different thicknesses [17,18,19]
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