Two-dimensional drift-diffusion study of mid-gap states and subsequent vacuum level shifts at interfaces in bulk-heterojunction solar cells

Ahläng, Christian; Sandberg, Oskar J.; Österbacka, Ronald

doi:10.1103/physrevb.98.075306

Cited by 2 publications

(2 citation statements)

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“…52 Furthermore, the role of midgap states at interfaces on the vacuum-level landscape in BHJ solar cells has been analyzed by two-dimensional DD. 53 Three-dimensional DD models have been used to study the role of the charge carrier mobility 54 but neglect the local variations in the energetics. Most critically, DD models assume the immediate equilibration of charge carriers and cannot capture transient effects accurately.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Buxton et al employed two-dimensional DD to study structure–property relations in OSCs . Furthermore, the role of midgap states at interfaces on the vacuum-level landscape in BHJ solar cells has been analyzed by two-dimensional DD . Three-dimensional DD models have been used to study the role of the charge carrier mobility but neglect the local variations in the energetics.…”

Section: Introductionmentioning

confidence: 99%

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Role of the Interface and Extraction Layer Energetics in Organic Solar Cells

2021

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Interface engineering plays an important role in performance improvement for bulk-heterojunction organic solar cells (OSCs). The charge carrier dynamics and energetic landscape at the donor:acceptor (D:A) interface can strongly differ from the bulk of the active layer. This is particularly crucial for the device performance when the interface is strongly disordered or nanostructured. In this work, we present a kinetic Monte Carlo (kMC) study to clarify the role of the disorder at the D:A interface and the interface between the photoactive layer and the extraction layer on the performance of bulk-heterojunction OSCs. We parametrize the material parameters for a moderately efficient OSC. Our results demonstrate that the disorder at the D:A interface especially tailors the photocurrent and fill factor, while the disorder at the extraction layer mainly controls the open-circuit voltage. The D:A interface plays the dominant role in device performance and needs to be controlled to achieve efficient OSCs. Furthermore, we show that losses due to the interface disorder can be partially restored in the presence of energy cascades by mixed phases within the interface region.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%