Abstract
AbstractConsidering the robust and stable nature of the active layers, advancing the power conversion efficiency (PCE) has long been the priority for all‐polymer solar cells (all‐PSCs). Despite the recent surge of PCE, the photovoltaic parameters of the state‐of‐the‐art all‐PSC still lag those of the polymer:small molecule‐based devices. To compete with the counterparts, judicious modulation of the morphology and thus the device electrical properties are needed. It is difficult to improve all the parameters concurrently for the all‐PSCs with advanced efficiency, and one increase is typically accompanied by the drop of the other(s). In this work, with the aids of the solvent additive (1‐chloronaphthalene) and the n‐type polymer additive (N2200), we can fine‐tune the morphology of the active layer and demonstrate a 16.04% efficient all‐PSC based on the PM6:PY‐IT active layer. The grazing incidence wide‐angle X‐ray scattering measurements show that the shape of the crystallites can be altered, and the reshaped crystallites lead to enhanced and more balanced charge transport, reduced recombination, and suppressed energy loss, which lead to concurrently improved and device efficiency and stability.
Highlights
All-polymer solar cells are considered as a promising photovoltaic technology due to their exclusive advantages
The chemical structures of PM6, PY-IT, CN, and N2200 are shown in Figure 1A, and their optical properties, that is, the absorption in neat films and blend films, are shown
The addition of N2200 into the PM6:PY-IT blend leads to a further increased VOC relative to the device processed with CN as additive compared, which draws our interest since no significant blueshifts in absorption and external quantum efficiency (EQE) spectra are observed
Summary
Research Major Program of Guangdong Province, Grant/Award Number: 2019B030302007; Grant/Award Number: 2019B121205002; Shen. Zhen Technology and Innovation Commission, Grant/Award Numbers: JCYJ20170413173814007, JCYJ20170818113905024; Hong Kong Research. Council VR, Grant/Award Number: 2016-06146; Swedish Research Council and The Knut and Alice. Wallenberg Foundation, Grant/Award Numbers: 2017.0186, 2016.0059; Hong Kong PhD Fellowship Scheme, Grant/Award Number: PF17-03929; Natural Science Foundation of Top Talent of SZTU, Grant/Award Number: 20200205; China Postdoctoral Science Foundation, Grant/Award Number: 2020M673054; Postdoctoral Fund of Jinan University, and National Natural Science Foundation of
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