Abstract
Semitransparent organic solar cells (ST-OSCs) are promising candidates for applications in building-integrated photovoltaics (BIPV) as windows and facades. The challenge to achieve highly efficient ST-OSCs is the trade-off between power conversion efficiency (PCE) and average visible transmittance (AVT). Herein, solution-processed ST-OSCs are demonstrated on the basis a polymer donor, PM6, and a small molecule acceptor, Y6; lowering the visible-absorbing PM6 contents in blends could increase AVT and maintain PCE. Additionally, conductive polymer PEDOT:PSS is used as the top electrode due to its high transparency, good conductivity, and solution processability. Efficient ST-OSCs with 20 wt % PM6 achieve high PCE of 7.46% and AVT of 36.4%. The light utilization efficiency (LUE) of 2.72% is among the best reported values for solution-processed ST-OSCs. This work provides a straightforward approach for solution-processed ST-OSCs by combining a low fraction of visible-wavelength-selective polymer donors with near-infrared nonfullerene acceptors to achieve high PCE and AVT simultaneously.
Highlights
Building-integrated photovoltaics (BIPV) as electrical power generators are directly integrated into buildings to replace conventional building materials.[1]
The challenge for semitransparent-Organic solar cells (OSCs) (ST-OSCs) is that power conversion efficiency (PCE) and average visible transmission (AVT) need to be simultaneously optimized, as there is a trade-off between light absorption and transmission
The results suggest that reducing the visibleabsorbing donors contents in polymer/nonfullerene acceptors (NFAs) blends is a feasible strategy for efficient ST-OSCs with balanced PCE and AVT to overcome the contradictory requirements for the absorbers
Summary
Building-integrated photovoltaics (BIPV) as electrical power generators are directly integrated into buildings to replace conventional building materials.[1]. Among commercial NFAs, Y6 with a narrow band gap of 1.33 eV and strong NIR absorption coefficient of 1.07 × 105 cm−1 is a good candidate.[36] We observed that the photovoltaic performance of single-junction PM6:Y6 solar cells (opaque devices) exhibiting high tolerance to the donor contents from 10 to 45 wt % and dilute donor solar cells can still maintain efficient charge generation and collection.[37,38] Most polymer donors absorb visible light;[39,40] it is thereby possible to control the transparency in the visible range without compromising photovoltaic performance by tuning the donor content. The results suggest that reducing the visibleabsorbing donors contents in polymer/NFA blends is a feasible strategy for efficient ST-OSCs with balanced PCE and AVT to overcome the contradictory requirements for the absorbers
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