通过协同改善结晶和钝化缺陷实现稳定的钙钛矿太阳能电池，效率为 25.17%,Energy & Environmental Science

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通过协同改善结晶和钝化缺陷实现稳定的钙钛矿太阳能电池，效率为 25.17%
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-09-16 , DOI: 10.1039/d2ee02277j
Yihui Wu _{1,

2} , Qi Wang ₁ , Yuting Chen ₁ , Wuke Qiu ₁ , Qiang Peng _{1,

2}

Affiliation

光吸收剂的薄膜质量是限制钙钛矿太阳能电池（PSC）效率和稳定性的关键因素。在此，将一种新的 2-脒基嘧啶盐酸盐 (APC) 铵盐引入钙钛矿薄膜的表面和浅层，以进一步提高 PSC 的性能。APC 中的多功能基团不仅通过与嘧啶 N 的相互作用钝化碘空位（配位不足的 Pb ²⁺缺陷），而且还通过与嘧啶 N 的相互作用来补偿甲脒（FA）空位（配位不足的 I - ^）。N–H⋯I 氢键或离子键。APC 还可以微调 FA 基钙钛矿薄膜的结晶，从而实现约 5 μs 的超长光致发光寿命和超过 4 μm 的更大载流子扩散长度，与单晶钙钛矿相当。得益于出色的电荷载流子活性，这款冠军器件提供了令人印象深刻的 25.17%（认证为 24.51%）的功率转换效率 (PCE)、超过 84% 的显着填充因子和 1.184 V 的开路电压（在电压不足仅为 0.37 V）。此外，经过 APC 处理的设备表现出出色的长期储存和操作稳定性。该研究将为提高钙钛矿薄膜质量和实现高效稳定的PSCs开辟一条新途径。

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Stable perovskite solar cells with 25.17% efficiency enabled by improving crystallization and passivating defects synergistically

The film quality of a light absorber is the key factor that limits the efficiency and stability of perovskite solar cells (PSCs). Herein, a new ammonium salt of 2-amidinopyrimidine hydrochloride (APC) is introduced into the surface and shallow layer of a perovskite film for further improving the performance of PSCs. The multi-functional groups within APC not only passivate the iodine vacancies (undercoordinated Pb²⁺ defects) through interaction with pyrimidine N, but also compensate the formamidine (FA) vacancies (undercoordinated I⁻) via N–H⋯I hydrogen or ionic bonding. APC also finely tunes the crystallization of FA-based perovskite films, resulting in an ultralong photoluminescence lifetime of about 5 μs and a larger carrier diffusion length of more than 4 μm, which is on par with single crystal perovskites. Benefiting from the excellent charge-carrier activities, the champion device delivers an impressive power conversion efficiency (PCE) of 25.17% (certified 24.51%), a notable fill factor of over 84%, and an open-circuit voltage of 1.184 V (the voltage deficit is only 0.37 V). Additionally, the APC treated device demonstrates excellent long-term storage and operational stability. This study will pave a new avenue for improving the perovskite film quality and realizing highly efficient and stable PSCs.

更新日期：2022-09-16

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