Role of Exciton Lifetime, Energetic Offsets, and Disorder in Voltage Loss of Bulk Heterojunction Organic Solar Cells DOI
Rakesh Suthar,

T. Abhijith,

Hemraj Dahiya

et al.

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(2), P. 3214 - 3223

Published: Jan. 5, 2023

Recently, the power conversion efficiency (PCE) of organic solar cells (OSCs) has significantly progressed with a rapid increase from 10 to 19% due state-of-the-art research on nonfullerene acceptor molecules and various device processing strategies. However, OSCs still exhibit significant open circuit voltage loss (ΔVOC ∼ 0.6 V) high energetic offsets molecular disorder. In this work, we present systematic investigation determine effects offset disorder different recombination losses in (VOC) using 13 photoactive layers, wherein PCE ΔVOC vary ranges 2.21-14.74% 0.561-1.443 V, respectively. The detailed analysis all these devices was carried out, were correlated This enabled us identify key features for minimizing like: (1) low energy between donor states is essential attain nonradiative (ΔVOC, nrad) as ∼200 meV (2) Urbach energy, which measure materials' packing, should be minimization radiative rad). addition, time-resolved photoluminescence spectroscopy employed further understand exciton dynamics pristine materials donor-acceptor blends. It observed that absorbers ultralong lifetime (∼1000 ps) produce higher efficiencies. current study emphasizes importance simultaneously testing photovoltaic performance active layer rational optimization opens new prospects designing novel fine-tuning longer effective strategy boost their modified Shockley-Queisser (SQ) limit by losses.

Language: Английский

Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells DOI
Xiaobin Gu, Yanan Wei, Rui Zeng

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non-radiative recombination (ΔEnr) that occurs due exciton-vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y-SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small ΔEnr 0.184 eV, much lower than those Y-SS Y-SSe devices with weaker interactions. These achievements not only set record selenium-containing OSCs, but also mark lowest reported value among high-performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single-junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low-energy-loss high-efficiency

Language: Английский

Citations

9
High-performance binary organic solar cells by simultaneously enhancing exciton diffusion and charge transport in small molecule acceptors DOI
Xiaolei Kong, Xinjia Zhang, Zhenyu Li

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160740 - 160740

Published: Feb. 1, 2025

Language: Английский

Citations

1
Suppressing Kinetic Aggregation of Non‐Fullerene Acceptor via Versatile Alloy States Enables High‐Efficiency and Stable Ternary Polymer Solar Cells DOI

Kang‐Ning Zhang,

Jiajia Guo,

Liujiang Zhang

et al.

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(20)

Published: March 3, 2021

Abstract Despite considerable advances devoted to improving the operational stability of organic solar cells (OSCs), metastable morphology degradation remains a challenging obstacle for their practical application. Herein, stabilizing function alloy states in photoactive layer from perspective controlling aggregation characteristics non‐fullerene acceptors (NFAs), is revealed. The alloy‐like model adopted separately into host donor and acceptor materials state‐of‐the‐art binary PM6:BTP‐4Cl blend with self‐stable polymer PDI‐2T small molecule DRCN5T as third components, delivering simultaneously enhanced photovoltaic efficiency storage stability. In such ternary systems, two separate arguments can rationalize operating principles: (1) alloys strengthen conformational rigidity BTP‐4Cl molecules restrain intramolecular vibrations rapid relaxation high‐energy excited stabilize acceptor. (2) optimize fibril network microstructure PM6 restrict kinetic diffusion molecules. According superior morphological stability, non‐radiative defect trapping coefficients be drastically reduced without forming long‐lived, trapped charge species blends. results highlight novel protective mechanisms engineering composites reinforcing long‐term NFA‐based OSCs.

Language: Английский

Citations

44
Organic Photovoltaic Stability: Understanding the Role of Engineering Exciton and Charge Carrier Dynamics from Recent Progress DOI

Kang‐Ning Zhang,

Xiaoyan Du, Lei Yan

et al.

Small Methods, Journal Year: 2023, Volume and Issue: 8(2)

Published: May 19, 2023

Abstract Benefiting from the synergistic development of material design, device engineering, and mechanistic understanding physics, certified power conversion efficiencies (PCEs) single‐junction non‐fullerene organic solar cells (OSCs) have already reached a very high value exceeding 19%. However, in addition to PCEs, poor stability is now challenging obstacle for commercial applications photovoltaics (OPVs). Herein, recent progress made exploring operational mechanisms, anomalous photoelectric behaviors, improving long‐term OSCs are highlighted novel previously largely undiscussed perspective engineering exciton charge carrier pathways. Considering intrinsic connection among multiple temporal‐scale photocarrier dynamics, multi‐length scale morphologies, photovoltaic performance OPVs, this review delineates establishes comprehensive in‐depth property‐function relationship evaluating actual stability. Moreover, has also provided some valuable photophysical insights into employing advanced characterization techniques such as transient absorption spectroscopy time‐resolved fluorescence imagings. Finally, remaining major challenges related topic proposed toward further advances enhancing OSCs.

Language: Английский

Citations

18
Role of Exciton Lifetime, Energetic Offsets, and Disorder in Voltage Loss of Bulk Heterojunction Organic Solar Cells DOI
Rakesh Suthar,

T. Abhijith,

Hemraj Dahiya

et al.

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(2), P. 3214 - 3223

Published: Jan. 5, 2023

Recently, the power conversion efficiency (PCE) of organic solar cells (OSCs) has significantly progressed with a rapid increase from 10 to 19% due state-of-the-art research on nonfullerene acceptor molecules and various device processing strategies. However, OSCs still exhibit significant open circuit voltage loss (ΔVOC ∼ 0.6 V) high energetic offsets molecular disorder. In this work, we present systematic investigation determine effects offset disorder different recombination losses in (VOC) using 13 photoactive layers, wherein PCE ΔVOC vary ranges 2.21-14.74% 0.561-1.443 V, respectively. The detailed analysis all these devices was carried out, were correlated This enabled us identify key features for minimizing like: (1) low energy between donor states is essential attain nonradiative (ΔVOC, nrad) as ∼200 meV (2) Urbach energy, which measure materials' packing, should be minimization radiative rad). addition, time-resolved photoluminescence spectroscopy employed further understand exciton dynamics pristine materials donor-acceptor blends. It observed that absorbers ultralong lifetime (∼1000 ps) produce higher efficiencies. current study emphasizes importance simultaneously testing photovoltaic performance active layer rational optimization opens new prospects designing novel fine-tuning longer effective strategy boost their modified Shockley-Queisser (SQ) limit by losses.

Language: Английский

Citations

17