Significant Efficiency and Stability Enhancement of Flexible Perovskite Solar Cells Combining with Multifunctional Effects of a Natural Spice
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Abstract The numerous defect‐induced non‐radiative recombination losses and residual stress in the preparation of perovskite film greatly hinder the further improvement of the efficiency and stability of flexible perovskite solar cells (PSCs). Here, a natural spice 7‐amino‐4‐(trifluoromethyl)‐2‐benzopyrone (ATB) containing amino (─NH 2 ), carbonyl (─C═O), and trifluoromethyl (─CF 3 ) functional groups is introduced into the perovskite precursor solution, thereby preparing high‐quality perovskite film with low defect density. It is revealed that the utilization of ATB is beneficial to comprehensively passivate the defects and release the residual stress of perovskite film through the synergistic effect of functional groups, thereby improving the crystallinity and enhancing the carrier lifetime of perovskite film. Moreover, the introduction of ATB contributes to an improved energy levels alignment between the perovskite and adjacent layers, which facilitates fast carrier transport and suppresses the recombination loss in the flexible PSCs. Combined with the multifunctional effects of ATB, the target flexible and rigid PSCs with ATB modification yield remarkable photoelectric conversion efficiency (PCE) of 21.08% and 23.79%, respectively. More importantly, the ATB‐modified flexible device exhibits outstanding stability and retains 87.3% and 91.6% of the original efficiency after aging for 3000 h at 50 ± 5 relative humidity and 5000 bending cycles, respectively.Keywords:
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Solution-processed Cu2O and CuO are used as hole transport materials in perovskite solar cells. The cells show significantly enhanced open circuit voltage V oc, short-circuit current J sc, and power conversion efficiency (PCE) compared with PEDOT cells. A PCE of 13.35% and good stability are achieved for Cu2O cells, making Cu2O a promising material for further application in perovskite solar cells. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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Perovskite Solar Cells In article number 2300692, Chow, Chang, and co-workers employed Qu-CN as the hole transport material and Qu-COOH as the passivator on the surface of perovskite. Through this optimization, the perovskite has transitioned into the α/δ phase MAPbI3. This advancement has culminated in an impressive power conversion efficiency of 20.64% and excellent device stability in n-i-p PSCs.
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Abstract A new class of hole‐transport materials (HTMs) based on the bimesitylene core designed for mesoporous perovskite solar cells is introduced. Devices fabricated using two of these derivatives yield higher open‐circuit voltage values than the commonly used spiro‐OMeTAD. Power conversion efficiency (PCE) values of up to 12.11 % are obtained in perovskite‐based devices using these new HTMs. The stability of the device made using the highest performing HTM ( P1 ) is improved compared with spiro‐OMeTAD as evidenced through long‐term stability tests over 1000 h.
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In recent years, the instability of hybrid organic‐inorganic halide perovskite solar cells (PSCs) has been an important challenge. The issue of the destruction as well as a carrier density stability of the perovskite must be addressed to simultaneously achieve the long lifetime of PSCs and acceptable conversion efficiency. Present study aims to address these issues by using all‐inorganic CsPbBr 3 perovskite as a light absorber material. Through a simulation process, the perovskite thickness was optimized yielding the highest power conversion efficiency (PCE) of a device reaching 4.04 %. After storage for 3 months at room temperature with a humidity of 20 % and under illumination of AM 1.5 G, only 35 % loss in PCE was observed, indicating a promising stability of the fabricated CsPbBr 3 ‐based devise.
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Perovskite solar cells have emerged as a potential energy alternative due to their low cost of fabrication and high power conversion efficiency. Unfortunately, their poor ambient stability has critically limited their industrialization and application in real environmental conditions. Here, we show that by introducing hexamine molecules into the perovskite lattice, we can enhance the photoactive phase stability, enabling high-performance and air-processable perovskite solar cells. The unencapsulated and freshly prepared perovskite solar cells produce a power conversion efficiency of 16.83% under a 100 mW cm-2 1.5G solar light simulator and demonstrate high stability properties when being stored for more than 1500 h in humid air with relative humidity ranging from 65 to 90%. We envisage that our findings may revolutionize perovskite solar cell research, pushing the performance and stability to the limit and bringing the perovskite solar cells toward industrialization.
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CuPbSbS3 (bournonite) has emerged as a promising light-absorbing material for thin-film solar cells due to its attractive photophysical properties. The crystallinity of CuPbSbS3 films is a main challenge of achieving high power conversion efficiency. Herein, we perform a series of optimization strategies to enhance the crystallinity of CuPbSbS3 films, including adjusting the annealing temperature and reducing the carbon residue. The optimized CuPbSbS3 film acquires an enhanced crystallinity, and an optimal solar cell device based on it achieves a power conversion efficiency of 2.65% with good stability. This efficiency is the highest value for CuPbSbS3 solar cells up to now.
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